If you have existing users that you would like to offer a coupon to, you can do this in two ways:
1. Create a coupon to upgrade existing subscribers to higher plans
2. Apply a coupon manually in the backend to individual users.
1. Create A Promotional Coupon For Existing Users To Upgrade Plans
Navigate to the Marketing tab then click Coupons then New Coupons.
Then you need to name your Coupon offer and select your discount amount (in either percentages or a fixed amount).
To upsell existing users to a higher plan click Subscription, select the higher plan (i.e. Annual), then select the Duration of this discounted offer (i.e. Once)
Under Redemption Limits, make sure to check 'Allow this coupon to be used by current subscribers when changing plans.'
You'll then have a Coupon Code that your customers can use directly.
So, when your subscribers go to change their membership, they can click Apply a Coupon:
Then paste the Coupon Code to redeem the offer:
You can create a promotional upsell campaign with this by using the Email Broadcast tool to target specific plans and users to deliver this coupon code to.
2. Apply Coupon Manually In The Backend
Create a Coupon then navigate to the People tab, and under the second People tab, find the user for whom you will apply the coupon and click Edit.
Go to the Subscription tab to view their active subscription plan. Click the 3 vertical dots option and select Apply coupon. Choose from your list of coupons which one you will offer and select Apply.
You'll see the coupon applied on the selected subscription plan.