Anyone can sign up, by following the instructions set forth here. Once all your information has been turned in, Heather will send you a name of someone with their age, address, and their likes and dislikes for you to send something to. You will get a new person each month that you choose to participate. In turn, your information will be sent to someone else who will then send a package to you (this will be someone other than the person you are sending to). In the first day or two of each month, you can expect to find an email from Heather in your inbox detailing who you are to send a package to. Your package must be mailed out by the 15th of each month. Failure to send your package out on time more than six times in a year will result in your removal from the group.
What you choose to give and how much you choose to spend is up to you (using the guidelines sent to you in the email from Heather, of course). Handmade items are popular and well-received gifts, but it certainly does not have to be if you're not the crafty type.
May is my first month as a Secret Post Club member and I already have my person. I'm looking forward to putting a package together for her and, of course, getting a package of my own! Each month that I participate I will be sure to include a post letting you know what I got and, where applicable, link to the person who received my package. Sounds like fun!
So why not send Heather an email and sign yourself up. There's nothing like looking forward to getting something good in the mail!