Hi @Otis, thanks for bringing this to our attention.
It isn't possible to amend your email address via the Dropbox mobile app. You'd need to login to the site to make the change, though you'd still need to receive the verification email.
Is this a new or old account? Are you able to save your data, then delete it from the account, and then create a new Dropbox account under the correct email?
This will help me to assist further!