How do I enable the use Compound to use as collateral?

Hey, new here to the compound community, on the beginning of the Compound interface it has collateral assets listed Ether, Compound etc. How do I enabled to use my Compound tokens as collateral within the protocol? When I click supply Compound it does no give me the option to Approve & Add, any insight would be greatly appreciated thanks in advance?

USDC Mainnet:

USDT Mainnet:

Either of those markets will let you use COMP as collateral to borrow USDC or USDT on Mainnet.