I am great at the modelling and retexturing of an item, just not the renaming. I tried to change the source code of a gas mask, but did not affect the name when I playtested the game. Help?

It's very easy to change names of items in game, but this can cause problems with other source code, as it calls upon that specific item name, so as long as you know what you are doing, you can change them very easily.

Also you need to run the main.bb file in blitz3d, and launch it through that, unless you make it an executable.