If I upgrade to a 3 or 6 month package, do I pay all at once?
Yes, multi-month Basic, Premium, and Incognito packages are paid for upfront in a single lump sum, which is why they are heavily discounted.
If you'd prefer to pay monthly, you can sign up for a monthly membership. It isn't possible to receive the discounted multi-month rate with monthly memberships.
If you still need help, you can email a friendly human.