Hi,
How do you stack the codes? Can't follow the directions below as there is no such option:
Stacking Instructions
After you have signed up and redeemed your first code, copy the redemption code above to grab your next code.
Log into your account on the partner's website.
Visit this link: https://app.getcharla.com/billing.
Click "Increase Seat."
Paste your AppSumo code in the code field and click "Add Voucher."