flatforum made no changes

hi,
i followed all instructions in the documentations. also enabled the module and checked the existance of database tables. i am using pushbutton theme and i see no changes at the forum. i dont think that i did sth wrong however i may miss sth very critical. can u help me with this? the forum is available at www.universideliyiz.biz/forum. there are only sample caps so even no need to look at it. thanx