When you create an account with email and password, we send a verification link to your email. Your account stays inactive until you open that email and click the link, so this is the last step of signing up. (If you signed up with Google, this step is already done for you.)
Give it a minute, then check your spam or promotions folder. If it still is not there, you can send a new link.
If you just requested a link, give it a moment before resending so you do not end up with several emails at once.
Verification links are valid for 24 hours. If yours has expired, request a new one from the “Verify your email” screen and use the most recent email.