Steps would be a little different depending on the version of RME you have
The IP it displays is the one RME manages it on and was the one it was initially added to RME with.
you could delete the device and re-add it to RME by the other IP address (not that good as it will lose device info for the IP currently there)
OR
you can try adding the device by the other IP Address and it will report an alias entry and you then select to manage the device by the new address
ex) RME 3.5
RME - Admin - Inventory - Import Status - Alias
Then select the option from there
