Problem With Tempo Change

i want to start using more tempo changes in my tracks

i want the tempo to go from 228bpm to 144bpm

so i input fo90 but im thinking im doing something wrong because now the whole track plays at 144bpm at all times??

Remember Renoise will always go to any tempo change (or other automation or pattern effect command) at the start of the song. You also have to put the command at the start of the song to tell Renoise to play at 228bpm.

ok thanks,by any chance to you know what the effect command to tell renoise to play at bpm 228 is im not at my music comp right now

EDIT:found out its f0e4