If you used your social account to create your account, you'll have to continue to log in through the use of that social account. If you used an email to create your account, you have to use your email and password to log in. You can’t log into the account created by your social account with your email and vice versa.
You must be logged in for this. Right at the bottom of every chapter, before the next chapter, there should be five stars. Clicking the leftmost star means giving the translator 1 star. Clicking the rightmost star means giving the translator 5 stars. Once a star has been selected, you can’t change your choice.
For now, invited friends can only use their social accounts (Google, Facebook, Twitter) to sign up. Email cannot be used to sign up, when using a referral link.
The Badges system act as a sort of achievements system. If you visit the following link and tap on each badge, you’ll be able to find out what you have to do to get the badge. For certain badges, there are levels: https://www.webnovel.com/badges
It should be noted that you cannot choose whatever badge you wish to display, for now.
You can't delete your account. You'll need to seek out the help of a tech team member (look at the Tech Team section) who can be found on the forums. Simply create a thread, stating your desire to delete your account and why you want to delete it.