Hi, Roger (correct?) --
It looks like you are logged in on your wife's account, as Melanie mentioned.
It also looks like there is a profile for you that either you or your wife created: https://www.wikitree.com/wiki/Cooper-38138
Either you or your wife can add your email address to that profile.
Go to the profile with your name on it, click the Edit tab, and look down the page for the Email Address field:

Once you add an email address and save the profile, you'll get an invitation to join WikiTree in your inbox, and the process should be self explanatory from there.
If you have any trouble, you can email info -at- wikitree.com.
(replace "-at-" with @ to send that email.
)