Download the Tendy app. If you already have the app downloaded, just make sure you have an updated version: App Store: 2.0.0 / Google Play 45 (2.0.4) or a later version.
Click on this LINK HERE
You will now be taken to a payment page (Stripe) where you can complete your purchase.
Once the purchase is completed, you will receive a confirmation and need to log into the Tendy app so that your account can be updated with a premium account.
Done!