There will be a prompt at the top saying

[taniakmhatuntrishaht]

2) Register using an email address (it is not recommended to use a domestic email address to avoid problems with not receiving messages. It is best to use Gmail or something like that). The password must be at least 8 characters long and must contain Latin letters and numbers, and at least one uppercase letter.

ChatGPT Registration Tutorial (Detailed Guide)
3) After entering the information, click the [Register] button below. "We suspect greece phone number lead you are a human. Please verify through a robot" (complaint, other verifications are for suspected robots that need verification, but here it is for suspected humans that need verification, really...), no need to do anything, just wait a moment (no more than 5 seconds).

ChatGPT Registration Tutorial (Detailed Guide)
4) After successful verification, you will see a green check mark on the bottom saying “Success” and click the [Register] button again.