Ok, I'm new to this, so I'm gona sound like and idiot. I'm using UE4 and want to have multiple people work on the project without having to swap a external HHD. I've got GitHub all set up with Source Tree, but now i don't know how to let others access the repo. HELP!!!!!!
I think you should learn the basics of git first....
git itself does not have any user access control - therefore SourceTree does not have any user access control: basically everybody who has physical access to your should repository be able to clone it.
Now you can introduce some restrictions to the storage location of your repository: if it's locally stored you might have some restriction on file acces level (but this is not common with git AFAIK). That's where repository hosting sites enter the game: github or Bitbucket.org (to name 2 public gitrepository hosting services) do offer user access control. You cannot access the repositories there directly on tfilesystem level but you have to use a web-interface. Within the web-interface the user access control is implemented.
So to answer your question in short: You cannot use SourceTree to grant access on your Github hosted repository - you have to do this within the github-webpage. Your question is not a SourceTree question but a github question.
After setting the desired permissions on github, everbody with corresponding permissions can work with the repository (i.e. cloning using the github repository URL ...)
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