When registering, I misspelled my email address and not the site will not let me sign on.
You don't need to verify your existing email to be able to change to a new one.
how do I delete account
If you really need to delete your account, follow the steps outlined here:
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I had the same problem and was in a vicious cycle of Dropbox requiring me to verify my account by clicking a link sent to my email (which was misspelled and not valid). The only solution I could find was to delete the account and create a new one with proper email address.Hope this helps.