You don't normally need to do anything. With a 10-user license, you can activate up to 25 machines at once for use by up to 10 developers. You can deactivate a machine by going to Help | Remove License. If you forget, it won't usually matter because machines that are not used for more than 2 years are ignored when the licensing manager counts activations.
Should you still need to deactivate a license without access to the machine, please contact customer support with your activation code and invoice/receipt number, and you will be given a special URI to list and deactivate machines.
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Should you still need to deactivate a license without access to the machine, please contact customer support with your activation code and invoice/receipt number, and you will be given a special URI to list and deactivate machines.