Open Douyin, click on the "Me" icon in the lower right corner, then click on the three bars in the upper right corner.

Click on "Settings", then "Account & Security", and there is a Douyin password below, just set it and save it. If you forget it, you can also log in with your mobile phone number. When setting it, you need a mixture of numbers and letters. You need a mobile phone verification code when you first set it up.