ok..I've installed programs and I dont know how i can use them because I dont know where I can access them....please help

Use locate <softwarename>

You may need to issue the command 'updatedb' first, if you recently installed that software

do you want to run the program ? i understand the question that way.
i think you are new to the world of linux so you can forget about exe icons and stuff like that. if you want to start a program you have to open a terminal and for exampel type licq if you want to runt licq ( icq clone)
or you can create a shortcut on the desktop where you have to type the lokation of the program or youst type lika above licq in the shortcut.

so its almost the same funktion whit both of them but if you want you can have a nice little icon on the desktop =)

I would add that with the locate command, it's helpful to grep the results for bin, as most programs are dumped in a bin directory of some sort. ie:

locate program | grep bin