Adding SMS & Call credit
Adding credit to your account is super easy. Your credit will be shared across all your devices.
Click on Profile image top right, then click on the text "My Profile"
Click on tab "SMS"
Click on the cog on the top right to Add/change SMS credit or the blue button "Add Plan"
Select your preferred subscription type
Enter card details. Once the payment has been made, your account will be adjusted
You can also follow this video: