I just installed metamask and when I click import it asks for a private key. I have no idea what that is from my coinbase wallet. All I see in my coinbase wallet is my 12 word phrase, where do I find the private key of my coinbase wallet?
You first need to log out. in order to do so, click on your account picture on the top right. then click on "lock". this will log you out of Metamask. after logging out, right before you enter your password to log in, on the bottom of the login page you can see a link that says "Import using account seed phrase".
Also, take note that Coinbase won't give you your private keys. So you can't import a Coinbase account to Metamask by the private key.