1. Open your Telegram account and click on the three-line menu on the top left corner of the screen. 2. Click on "Settings" and then "Premium." 3. Select the premium plan you want to buy. 4. Enter your payment information, which may include a credit card or a payment service such as PayPal or Google Pay. 5. Follow the prompts to complete the payment. Once the payment is successful, your Telegram account will be upgraded to premium, and you will have access to all the premium features.