To start off, you need to grab the necessary rpm packages. Just go to pbone and type RapidSVN and wxGTK in the search box. and look for the correct rpm packages that match your OS. Besides this, you also need to have subversion, instead of using rpm, i am going to use yum to do ityum install subversion
After that, install wxGTK follow by rapidSVN.
rpm -ivh wxGTK-2.8.9-1.el5.rf.i386.rpm
rpm -ivh rapidsvn-0.9.6-2.el5.rf.i386.rpm
If everything done nicely, you should be able to launch RapidSVN as below
Link to launch the RapidSVN Subversion Client RapidSVN GUI Interface