[jackhammer]

If i buy 3 months membership i will need to pay every 3 months or i will be a member only 3 months?

[hawk5005]

If i buy 3 months membership i will need to pay every 3 months or i will be a member only 3 months?

Both, but you can cancel your subscription so paypal won't have to take money from your card every 3 months.
If you don't know how to cancel it on your end, ask RedEyes(Santa) here to cancel it for you after it's been purchased.