Select the app launcher iconin the upper-left and choose Admin.
In the admin center, choose Billing > Subscriptions.
On the Subscriptions page, select the subscription that you want to remove licenses from. If the subscription was purchased directly from Microsoft by credit card or invoice you’ll see the Add/Remove users link in the Users section. If you see the Add/Remove users link, then select the link.
In the Total licenses box, enter the total number of licenses that you need for this subscription and then select Submit. For example, if you had 110 licenses and you need to remove 5 of them, you would enter 105.