The My account › Licenses section lists all your keys with their product, plan, activated sites and renewal date.
Releasing an activation
Click Deactivate next to the domain concerned. The activation becomes available again immediately for another site.
Renewing
A reminder is emailed 30 days, 7 days and then the day before the due date. Click Renew from the Licenses section: the new period is added to the current expiry date, so you lose nothing by renewing early.
Adding sites
A license is tied to its plan (1, 5 or unlimited). To cover more sites, order the appropriate plan: you receive a new key, and the old one stays valid until its expiry.
After expiry
Installed plugins keep working for 14 days, without updates or support. After that, they pause until renewal: your settings and data are kept.