In case you decide not to enter a license key upon installing CF 2018, or if you entered one at installation, but want to enter a different one to upgrade between versions, there doesn’t seem to be any documentation on where to do that.
The System Information screen can be accessed by clicking the “i” in a circle in the upper right-hand corner of the admin screen.
In the System Information screen, enter your license key into the New License box and click Submit Changes.
