It depends on how you want to pay.
If you want to pay by check, or money order, just send the money as you normally would (http://www.livejournal.com/support/faqbrowse.bml?faqid=21), but make sure to include (on the printed note) the username of the recipient. (We do not recommend sending United States currency/cash through the mail, as it can easily be stolen and there is absolutely no way to recover it. If the payment does arrive at our office, we will accept it. Please make sure you include a note with your email address and username (if you have one), and also that of the recipient.)
If you want to pay using PayPal, just go to the main Paid Accounts page on LiveJournal's site and click the gift link to get an expanded form where you can enter the recipient's username:
Also, FAQ21 ("How do I buy a paid account?") has been updated. It's also been renamed to "How do I buy a paid account?" because it didn't really deal with what a paid account *is*, just how to buy one.
For pricing information, and on how to pay by credit card either in or out of the United States, see:
If you want to pay while creating a new account, you can do so at (http://www.livejournal.com/create.bml)
CHECK or MONEY ORDER:
You can send a check or money order to:
9350 SW 175th Ave
Beaverton, OR 97007-9768
Make checks payable to "LiveJournal.com". Please include a clearly printed note with your username and e-mail address on it. If paying for an existing account, the payment will be put towards the specified username. To pay for a new account that hasn't been created yet, send just your e-mail address instead; an account code will then be emailed to you, and you can use the code to create a paid account.
We do not recommend sending United States currency/cash through the mail, as it can easily be stolen and there is absolutely no way to recover it. If the payment does arrive at our office, we will accept it. Please also include a clearly printed note with your username and email address as well.
NOTE: Our bank has informed us that we can no longer accept checks from countries other than the United States and Canada. International users should first try the online payment services. If those are not available to you, you will have to obtain an international money order in United States funds.
None of the FAQs contain the address to send payments to. The address appears in a confirmation screen.
Furthermore, I've edited create.bml to no longer have references to PayPal (replaced with linkage to /pay/) and to use lj comm tags instead of lj user tags.
So there we are. Breathe.