having a problem guy's..

i'm building a song....got my chords entered in and choosing a style for it

but no matter what style i choose and try....i set the tempo....and it start's climbing on me..
i'll set it at 82 BPM and every couple of Bars it starts shooting up....all the way too 254 Bpm and stuff..
its giving me a headache cause i can't figure it out....the book say's tap the + or - button ...i'm doing what the say's....but still it climbs on me...AARRARRAAR

how do i anchor this tempo in one spot....help

cajun