Step 2: Scroll down to footer and find 'Add Network1' button.
Step 3: On clicking 'Add Network1' your Metamask will open.
Now enter your password and click on 'Approve' button.
It will ask you to switch from your current blockchain network to Network1 .
Click on 'Switch Network'
Now as Network1 is added, you can access and interact with Network1 via Metamask wallet.
Troubleshooting
If the button does not work, head over to Network Configuration and enter all those details manually into the 'Add New Network' section of your Metamask.