pls hw do i make payment online using my gtb account, pls advice needed

When you visit a website where the item you like is being sold (konga.com, quickteller.com, etc), then choose to buy the good or service. Then checkout and click to pay by mastercard option. Then you will be asked to enter your card details as they are shown on the physical gtbank card you have. The website may require you to register first before making this payment or allow you to check out as guest. After entering your card details front and back, your card will be charged successfully for the transaction. You sounded a newbie entirely with your question, right?

By the way, make sure you have activated your card for online usage on gtbank internet banking portal before this, using the activation code generation there. You will need their hardware token to complete this step. You can proceed to generate your MasterCard secure code in this process.