A: Hello,

Step:1 (If user having stackable code)--Now here is i am adding few more steps for Upgrade / stackable codes (applying a stackable code to unlocks unlimited sites plan)
User need to login on our website https://www.wponlinesupport.com/my-account/ and then click on : " License Keys" tabs (https://www.wponlinesupport.com/my-account/?tab=license-keys ) and check for " View Upgrades" link. Click on this link.

Step:2--Once user will click on this link, user can see one more screen .
Note: If you have stackable code then please ignore the price showing. Just click on "Upgrade License" and enter the stackable code in the checkout page.

Step:3--User need to click " Upgrade License" to add the stackable code to redeem. Now user need to complete the same process and complete the code redemption.