To register on the Shopee Thailand version app, you can follow the steps below:

1. Download the Shopee Thailand version app and open it.

2. Click the "Me" icon in the lower right corner.

3. Click the "Register" button.

4. Enter your mobile number and select your country code.

5. Enter your verification code and click the "Next" button.

6. Enter your username and password and click the "Register" button.

7. If necessary, you can choose to add your personal information and delivery address.

8. After completing the registration, you can start shopping with the Shopee Thailand version app.

Please note that you need to provide a valid mobile phone number and make sure your device is connected to the Internet. At the same time, you also need to comply with Shopee's user agreement and privacy policy.