There's two ways to add in a coupon code - depending on the type of code it is.
If you have a code which gives you a percentage off a monthly or annual plan, follow the instructions in this article here.
If you have a code which gives gives you full access to a plan (say a lifetime code), simply go to your account.
Choose "Redeem Code"
Enter it in the Redeem code field and click Activate.
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