If you have a git repository and you want to grant permissions to an existing user, this can be done like the following:

After you log in click on your project, to enter its details:

perm1
perm1

Now on the navigation to the left you find “Project information -> Members”, where you can manage your members:

Next, search for the person you want to give permissions to, in the text field “People”:

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perm3

Now the most important part, select the permission you would like to grant this user, you can choose between Guest / Reporter / Developer / Maintainer, to get more information about these variants please visit the following page:

perm4
perm4

Finally save the data you have inserted:

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perm5