There are no steps, really. It already comes installed on Fedora systems, and a person just needs to use the command
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
There are 2 ways to achieve the following goal, one way would be to use the GUI to install Chromium, which is as simple as going to the software Center and Searching for Chromium :P Although, being a programmer, a CLI is always better and prefered to install things. To install chromium on Fedora, The Command is pretty simple :P
dnf install chromium
To Upgrade:
dnf upgrade chromium