Just follow these simple steps to activate Quick Payment:
Step 1: Tap on Reload from App homepage
Step 2: Choose eWallet Balance
Step 3: Tap on Quick Payment banner at the bottom
Step 4: Choose the bank card to activate Quick Payment
Step 5: Click Set Now button
There is an indication to show that you have turned on this function
Below are the articles that may be useful for you :
Can I delete my saved bank card or the bank card I’ve selected for Quick Payment?
What if I want to completely disable the Quick Payment function?
Is Quick Payment automatically turned on for my saved bank card?