How do I force a player to morph into a default 1.0 package?

I've tried to follow some youtube scripts and stuff, but I couldn't find how to do it.

What you want to do is go to roblox.com/develop, then inside Games click on the settings wheel next to the game you want to have robloxian 1.0. Now that you're inside "Configure Game" go to the Avatar settings on the left side of the screen and then under avatar body type options click Standard.