Reconfig an existing site to use Git token rather than password?

Hi - Like many who use GitHub I got the email that password access will soon be deprecated and we need to switch to token authentication. Fine, so I went into GitHub and created my token.

But how can I make this change to my site in Dreamweaver? When I go into Manage Sites and select the site, the whole Git section is grayed out, with no apparent way to update my authentication.