It's super simple.
When you're on another users' profile, there's a navigation bar up at the top - just under their photo/username:
You've got the option to 'Follow' or 'Message' a user. If you hit Follow, you'll get notified whenever they post something new.
If you hit Message, you'll get re-directed to a message screen where you can send them a private, direct message.
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How to Use Wattpad
RandomAre you to the platform or confused about how everything works? Check here for a start-up guide on the basics of getting around Wattpad.