Enter your activation codes (the ones from your license email) and we will open your secure billing portal. There you can change the number of computers, update your card, download invoices or cancel.
There you can change the number of computers (US$ 14.99/mo includes 1 PC; each extra PC is US$ 3/mo, prorated for the rest of the current month when you add it), update your card, or cancel. If you pay manually (not by card), reply to your license email instead.