So I was waiting for someone to come to my head shop then 2 people came named melissa_bucktin1 and Moh170202 and Melissa said can you add us both and I did then I turn around and I see melissa _bucktin1 was griefing and she took all my heads and wrecked the whole shop!!!!

 

You added them, it was your mistake. Next time, write down the heads you have somewhere or something. Not being rude here.

 

On creative it is impossible to grief as plots are protected.
Only invite people who you trust to the plot.
Locking and Archiving.