How do I change the end date of a member's subscription?

From Admin Home, go to the member's individual page in the administration panel.  Scroll down to the Subscriptions section.  Click on edit in the right hand column for the subscription.  This takes you to the page for that subscription. 

 

Start and End Dates not editable

To edit the start and end dates, you need to have Creator administrative rights.  So if the subscription page looks like the screenshot below, with the start and end dates not editable, it's because you don't have Creator administrative rights.  Ask the person with Creator rights to make the change for you, or give you Creator rights.

Click here for details on how to find out who has Creator rights for your organisation.