Migrating xMoons to Arbitrum Nova

Hi all. I wish to migrate xMOONs on XDAI to Reddit’s official currency. I’ve attempted to use the Reddit’s Community Points Bridge but their Discord support is lousy. After connecting the Metamask wallet and attempting step #2 Switch to Reddit Test Network it says “This network is not available in your Metamask, please add it”. I confirm I’m using the network Arbitrum Nova. I thought I’d try people with experience on Gnosis this end to see if anyone has any ideas. Any tips?