You can create an account on the website via the LINK or start the APP directly using Telegram.
If you start it with the APP, you will be registered automatically.
In case you want to proceed with the link, you should hit "Sign in" and enter your credentials to create an account.
Confirmation via your email will be needed (make sure to check your spam folder).
Then you need to proceed with filling in the KYC of the "Personal" section of your profile. Click on your profile icon, then "Profile", and navigate to "Personal". There you can fill in the form.