Because your repository is exposed over WebDAV, you and all of your developers can mount your Maven repositories as WebDAV drives, allowing you to interact with it just like a local drive (drag and drop operations, etc).
The user name you use will be the one you setup when you created your account - if you click on the account details icon (a little cog up the top right) then you will be able to see your current user name. Use this - NOT your email that you logged in with.
How to mount this depends on your operating system, but here are some pointers:
See the Apple KB article
See our Linux article