When installing Fedora 28 to a new computer, the live version of the disk image does not give the option to set the user ID or group ID manually. Instead, the first account created is automatically assigned an ID of 1000, which is typically reserved for admins. For those who plan to do work collaboratively on a shared server, having distinct user and group IDs for each user is essential to prevent users from accidentally editing someone else's documents.

Unfortunately, these IDs are not editable for the user that is currently logged in. Thus, to change your primary account's IDs, you must first create a second user via Settings > Details > Users, ensuring that the new user is an administrator. After switching to this admin account, open terminal, and enter the following commands, with the desired IDs and relevant login/group names.

sudo usermod -u <NEWUID> <LOGIN>
sudo groupmod -g <NEWGID> <GROUP>
sudo find / -user <OLDUID> -exec chown -h <NEWUID> {} \;
sudo find / -group <OLDGID> -exec chgrp -h <NEWGID> {} \;
sudo usermod -g <NEWGID> <LOGIN>

(from: https://muffinresearch.co.uk/linux-c...gids-for-user/)

Now when you log back in to your original account, running the command id in command line should show that you have the updated IDs.

Alternately, if your computer will have internet access while you install Fedora, it would be much easier to use the netinstall image (found under Other Downloads on https://getfedora.org/en/workstation/download/) and you will be prompted to input these IDs when you initially create your user.