Make sure that you are logged in to your Facebook account that you want to register to Shopee on the Facebook app.
Step 1: Launch the Shopee app.
Step 2: Go to "Me" tab > tap the "Sign Up" button.
Step 3: Tap the “Connect with Facebook” button.
Step 4: Authorize the Shopee app to connect to your Facebook account.
Step 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.