How do you insert a script into a running game?

I know that there is a method to doing this, how would you insert a ROLOX Model that is a script into a game that is currently running, doesn't it have something to do with coroutine?

Please help.

you should ungroup the model then do this inside a script tutorial: Instance.new=("script",What hierachy you want the object in) Instance.new=("script",Workspace)