Email bridges@torproject.org from a Gmail, or Riseup email address.
You need a Gmail or Riseup account here!
Use Moat to fetch bridges from within Tor Browser.
This is a built-in tor-browser feature for requesting bridges. You need to request the bridges yourself through a tor-browser and then add them to the system!
This will not be easy because you have to use one of the methods described on the documentation page to get the bridges. Here they are: