1. Visit Premium page: https://www.airdroid.com/en/pay/ , and choose a suitable plan:
2. Sign in to AirDroid and click the Premium button: web.airdroid.com
3. Open AirDroid app on your device, sign in and go to Account > Go Premium:
4. Go to AirDroid Win/Mac > Account > Go Premium:
[Help & FAQ] How to Pay with Debit Card/Credit Card?
[Help & FAQ] What's the User Type of My Account?
[Help & FAQ] Paid But Failed to Activate AirDroid Premium?
[Help & FAQ] Paid But Not Receive Activation Code?