When installing fedora I almost always forget to tick the “make user an administrator” box. Then when I want to install some software or update later I get a rather morose ticking off from my terminal… 

“Username is not in sudoers file. This incident will be reported”.

 Just what every girl wants to hear… one response to this is could be a breathy “yes mister Grey”… I personally just swore at the blasted thing. 

Anyway, here is a complete and simple overview of the fix:

1. Log out
2. Click “other”
3. Put the user name root
4. And the password root
5. Open a terminal and run usermod username -a -G wheel (replacing username with the username of the account you want to be an administrator.