In order to see your REV balance inside your MetaMask wallet you will need to switch to the REV network. You can manually add that network by following the steps below.
1. Log into your MetaMask account
2. Click on the top left corner icon to select your network
3. Click +Add network
4. Click Add a network manually
5. Fill in the following details:
Network Name: REV
New RPC Url:https://rpc.revolution.blockfabric.net
Chain ID: 30130
Currency Symbol: REV
Block Explorer URL:https://explore.mainnet.revolution.blockfabric.net
6. Click Save
The REV network has now been added to your MetaMask!
You can switch to the REV network at anytime by clicking the top left corner icon and selecting REV.