To create a master account on Shopee Indonesia, you can follow the steps below:

First, download and install the Shopee app.

Then, open the app and select the "Register" option.

Enter your mobile number and follow the on-screen instructions to complete the verification process.

Next, create a secure password and fill in personal information such as name and email address.

Once completed, you will receive a confirmation SMS, click confirm to complete the account creation process. Now you can log in to your master account and start shopping and selling goods on Shopee.