In my map, someone creates a shield battery, it turns into a bunker, rines spawn, they enter bunker, and i want to make it where u cannot unload but idk how.

You can choose between two options: Bring or Command option.
I myself always use Bring.

Cond: Player 'x' bring 'at least' '1' 'shield bat'
Action: Center location labeled 'remove shield' on 'shield bat' owned by 'Player 'x'' at 'Anywhere'
Create '1' 'Bunker' at 'remove shield' for 'player 'x''
Preserve trigger

Apply the technique in tutorials for the rest (bunkers-related shitz):
http://www.staredit.net/?p=tutorials&tut=9
http://www.staredit.net/?p=tutorials&tut=79

Do not forget Hyper Triggers!

Disabling the bunker will make the unload button no longer work.

Moving the bunker will make it fire in its previous location, but the actual bunker will be located elsewhere (you can stack it via preplaced buildings if you want).