i have some mods that i llike very much and can play on privet but whan i try to use thame in a room on the multi player it wount let me, for example "Wolverianmod"

if some one know how to fix it or is it even fixable please tell me.

You cannot change the mods in public servers because,
1. You usually make tc in public servers don't want anyone messing it up
2. If u changed the game rules staff would have to go back and reset it would be to tedious and annoying.

Basically mods have to be "checked" and approved before they are allowed to be used via multi-player. You can submit mods here.

As far as I know, it really doesn't take a long time for them to be accepted.