The admin email the wordpress autofills is simply a suggestion. It is common for people to have an admin@ email address for their site, but the program does not know for sure.
I see in your account that such an account does not exist. This means that an email sent to that address will simply go nowhere.
You can certainly create an email address for it using your cpanel.
The email sent to that address from the wordpress will simply have the admin username and password you assigned it during the install. If you have forgotten what that information is, you may want to remove the wordpress and reinstall it once you have the email address set up. You can also change the admin@ email address it fills in with another legitimate email address if you so desire.
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