Gonna quote CKtalon here:

CKtalon Doesn't seem like you can do it from the app.

Try going to the following on your phone: https://m.webnovel.com/settings

If you're not on the app, then I think it should've asked you to activate your email when you signed up, if you signed up using email. If you signed up with a social account, then it should've automatically activated the account. I think?

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