I missed spelled my email address when I set up my apple ID. How do I change it now?

See Change your Apple ID https://support.apple.com/en-us/HT202667. 

And see What to do after you change your Apple ID or 

Password https://support.apple.com/en-us/HT204071 (supplementary to what the fist link says)

Did you change it from the misspelled to the correctly spelled address?

You could try setting up a new ID and make sure you spell the address correctly.