How to install jar/ jad files samsung sgh e 250-. I have the .jad/.jar files stored on my memory

Question

I have the .jad/.jar files stored on my memory card and need to install thegames on the phone. how do i go about.I have the Samsung M520 and have been trying to install jad /jar files for 3 days. these files have to be in the internal phone not a subfolder. I can't get passed the file manager. and if I try to open there it says files not supported. They need to be in games or applications. Help!