I have the RSA (Rational Software Architect) 7.5.5.3 and i implemented the findbugs in my IDE. But i need to implement the PMD in my RSA. So please tell me the procedure or way to implement this to my RSA.
According to this link, you need to use a release of the PMD for Eclipse plugin that corresponds to the Eclipse version your RSA version is based on. According to Wikipedia, that is Eclipse 3.6 aka Helios.
Apart from that ... it is just a plugin, so you should be able to install it like other Eclipse plugins.
UPDATE - I just noticed that you mentioned two different versions of RSA. Check the 2nd link to find the correspondence for the version you are actually using.