Make sure that you are logged in to your Facebook account that you want to register to Shopee on the Facebook app.
1. Launch the Shopee app.
2. Go to ME tab > tap the "Sign Up" button.
3. Tap the “Connect with Facebook” button.
4. Authorize the Shopee app to connect to your Facebook account.
5. Complete the registration by creating your Shopee username and email (optional).
To add password, simply go to “Me” > “My Account” > “My Profile” > “Add Password”
New password must be 8-16 characters long, and should contain atleast one uppercase and one lowercase character.