How can I remove a URL channel from Anaconda?

Recently I needed to install PyPdf2 to one of my programs using Anaconda. Unfortunately, I failed, but the URLs that was added to Anaconda environment prohibit the updates of all the Conda libraries. Every time I tried to update anaconda it gives the following

conda update conda
Using Anaconda Cloud api site https://api.anaconda.org
Fetching package metadata ..........Error: Invalid index file: https://pypi.python.org/pypi/PyPDF2/1.26.0/win-64/repodata.json: No JSON object could be decoded

I typed the command conda info to see what causes the error, I found lots of URLs that points to PyPdf2!

Simply, I want to remove all these URLS from anaconda's channel URLs, How can I do it? No matter manually or automatic.

Note: I have uninstalled Anaconda, and reinstall, but no luck!

C:\WINDOWS\system32>conda info
Using Anaconda Cloud api site https://api.anaconda.org
Current conda install:

             platform : win-64
        conda version : 4.1.6
    conda-env version : 2.5.1
  conda-build version : 1.21.3
       python version : 2.7.12.final.0
     requests version : 2.10.0
     root environment : C:\Anaconda2  (writable)
  default environment : C:\Anaconda2
     envs directories : C:\Anaconda2\envs
        package cache : C:\Anaconda2\pkgs
         channel URLs : https://pypi.python.org/pypi/PyPDF2/1.26.0/win-64/
                        https://pypi.python.org/pypi/PyPDF2/1.26.0/noarch/
                        https://conda.anaconda.org/C:\Python27\Lib\site-packages\PyPDF2/win-64/
                        https://conda.anaconda.org/C:\Python27\Lib\site-packages\PyPDF2/noarch/
                        https://conda.anaconda.org/X:\Downloads\Compressed\PyPDF2-master\/win-64/
                        https://conda.anaconda.org/X:\Downloads\Compressed\PyPDF2-master\/noarch/
                        https://github.com/mstamy2/PyPDF2/zipball/master/win-64/
                        https://github.com/mstamy2/PyPDF2/zipball/master/noarch/
                        https://pypi.python.org/pypi/PyPDF2/win-64/
                        https://pypi.python.org/pypi/PyPDF2/noarch/
                        https://pythonhosted.org/PyPDF2/win-64/
                        https://pythonhosted.org/PyPDF2/noarch/
                        https://github.com/mstamy2/PyPDF2/win-64/
                        https://github.com/mstamy2/PyPDF2/noarch/
                        https://repo.continuum.io/pkgs/free/win-64/
                        https://repo.continuum.io/pkgs/free/noarch/
                        https://repo.continuum.io/pkgs/pro/win-64/
                        https://repo.continuum.io/pkgs/pro/noarch/
          config file : C:\Users\Dr. Mohammad Elnesr\.condarc
         offline mode : False
    is foreign system : False

Solution

Expanding upon Mohammed's answer.

All those URLs that you see in your conda info are your channel URLs. These are where conda will look for packages. As noted by @cel, these channels can be found in the .condarc file in your home directory.

You can interact with the channels, and other data, in your .condarc file with the conda config command. For example, let's say your .condarc file lists the following channels:

channels:
  - https://github.com/mstamy2/PyPDF2/  
  - defaults

Then if we do conda config --get channels we will see returned:

--add channels 'defaults'   # lowest priority
--add channels 'https://github.com/mstamy2/PyPDF2/'   # highest priority

If we then want to remove the github channel we would do conda config --remove channels 'https://github.com/mstamy2/PyPDF2/'. You can also add channels through the --add command so, for example, we could add back that channel with conda config --add channels 'https://github.com/mstamy2/PyPDF2/'.

In this case, since there were several channels to remove, it was probably faster to simply edit the .condarc directly but it's useful to know how to do it through conda config.