Why isn't my email address available when trying to update my apple ID?

Hey there DaveVL4,

Upon researching your question, we were able to find an article that lists the steps to change your Apple ID email, but we wanted call special attention to the section 'If you can't change your Apple ID' as it may explain what could be causing you to not be able to select a specific email: Change your Apple ID

If you had more questions about this after making sure that none of those reasons apply, then we recommend contacting Apple Support next as they'll be in the best position to further assist: Get Support

Cheers!