Putting weapons in your starterpack:
Open up Roblox studio (start > all programs > roblox > roblox studio)
Click My roblox
Click edit
Then click insert (the grey one)
Go to tools
Click the tool you want
A message will ask you if you want the tool in the starterpack, click Ok
You can also make one, or get one in free models (if you want)
Taking out tools from your place:
Open up Roblox studio (start > all programs > roblox > roblox studio)
Click My roblox
Click edit
Then click view > explorer
Click the + beside starterpack
Click the tool you want to delete
Click Ctrl + x |