Manually change the Expiration Date for Members

Hello I am running a premium website of more than 7000 members and I am thinking of changing the old platfrom (Magic Members) and go to your membership plugin. I have a big question though in which I am afraid I will read what I am afraid of... Is there a way to manually change or add the expiration date of each member? You see I have many people pay me through wire transfers and paysafe cards. So, paypal is an option for some but not all. So in the current membership plugin I have the freedom to add or change the expiration date of a member, but I didn't see this option (the expire date is not editable) in your plugin. Please help me because I have to clear this before its too late.

Thank you