When you want someone else to do something, do not use 〜たい. That is not allowed due to Volition. You can express that you want someone to do by 'wishing' however.
Form
〜て + 欲しい
食べてほしい I want you to eat this.
The resulting form is still a 形容詞 (i-adjective), so it can be conjugated
行ってほしくなかった I did not want you to go.
Who?
With に you can specify whom you want to do something
私は子供にもっと勉強して欲しい I want the child to study more.
昨日はあなたに早く来てほしかった Yesterday, I wanted you to come early.
Negative
Can put negatives in two places. Remember kids, putting the 'no' first puts the person second!
食べて欲しくない I don't want you to eat it (weaker)
食べないで欲しい I want you to not eat it (much more assertive)