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@Milek_Milek You have to use the number pad. If you don't have a number pad, there is a version of this mod that uses different keys. (Here: https://www.gta5-mods.com/misc/simple-trainer-for-gta-v-better-controls#description_tab)

I'm assuming you have to be past a certain level, as I can't see it. If this isn't the case, please tell me.

For those who can't find it, you have to target the person (like how you would if you are going to attack them) then in the top left it will say what you can do.