Where do I edit Expiration Date?

I just can't find it. If I click on the user in Subscriptions, I do not see "Expiration Date" anywhere. I'm using the latest version of MP. We've just migrated our database to an upgraded website, and a few members either renewed or joined after we migrated the db last week. I'm trying to manually renew a subscriber for a one-year membership. She paid for a year after we moved the db. I don't want to reset her password, change her email, I just want to give her another year's membership. I see that available when adding a new member, but she is a long-time renewing member.

Thanks