Purchasing 10$ italki credits or above, you will have Premium Membership for 1 year. Any new purchase within the next year will automatically renew your membership for another year.
You can check your Premium Membership status and expiration date on your Settings page here: https://www.italki.com/settings/account
A small badge is next to the italki Premium user's name.
You can also create your personal URL so that people can find your profile page easily!
For example: italki.com/joffrey
If you are a teacher, your personal URL will take a visitor to your teacher profile page directly.