Wattpad now supports integration with Google Smart lock. Google smart lock integrates with compatible Apps to save your password information across multiple devices.
If you already have Smart Lock enabled on your device, you will be asked if you wish to save your login information when logging into Wattpad via the App, Mobile Web, or Web.
If you have accidentally saved your password and wish to remove it, you will need to do so from your Google passwords list, which can be found here.
If you have not enabled Smart Lock before but wish to start using it, you can follow the steps outlined by the Google Help Center here.