Since it's not locked, I will give you a brief answer to get you going, then you should search around a bit to learn what you are actually doing when you type the following commands:
tar -xvzf FILENAME.tar.gz
cd FILENAME (without the .tar.gz)
You will need to have the "development" packages installed for those commands to work, and if you don't you should install them if you plan on installing "source" files more often.
But as was suggested, you, since using Redhat, would be better off going for the Redhat RPM file.
And as was suggested before also, I would suggest getting a program far less buggy, and more "featuresque", GAIM, http://gaim.sourceforge.net
Good luck, and once you read around and find out all there is to know, if you have any questions, I would be glad to help.
Welcome to LQ!