by "Choose a display name <thelocals_job_applicant protonmail com>".
You've already seen C-x C-f and C-x C-s to open and save a file. There are
other longer commands. For instance, you can also open a file by typing
-M-x open-file Enter. When you type a command using M-x, mg prompts you for
+M-x find-file Enter. When you type a command using M-x, mg prompts you for
the command at the bottom of the screen. You can type out the whole command
if you wish, or you can type out part of the command and then use the TAB key
for autocompleting the command.