To get Id3, you will need to install the simpleEducationalLearningSchemes package. Your screen shot shows the Explorer window, but to install a package, you should go back to the GUI Chooser and select the Package Manager under the Tools menu.
Once you have opened the Package Manager, scroll down to select the simpleEducationalLearningSchemes
package and click "Install"
Once the package is installed, Id3 should appear as an option under the trees
group of classifiers.