Ryan, you can't sudo to MxAdmin. The MxAdmin account is only a user in mendix not on the server.
If you open the m2ee tool (just type m2ee) you can setup the account.
Once you are in the m2ee tool you can type the ? character or the text 'help' and get a list of commands with simple explanation. In that list you should see the instruction createadminuser.
So running the command:
m2ee create_admin_user will start the process to create the admin account and allows you to setup the password.