Open MetaMask extension in your browser.

Select Main Ethereum Network

Press the menu icon on top left. Scroll all the way down and press ‘Add Token’

Select ‘Custom Token’

In ‘Token Address’ field add the FOAM contract address 0x4946fcea7c692606e8908002e55a582af44ac121

The rest of the fields will autofill. Press ‘Next’ and ‘Add Tokens’