Membership fees for Doha Mums are QR150 (US$42) per year and are paid online.  You can download the instructions for online payment here. You are welcome to have a friend make the payment on your behalf, regardless of whether or not that person is a member of Doha Mums.
Certain members or event coordinators may be willing to make the transaction for you in exchange for the QR150 in cash, plus a QR20 "convenience fee". While we sincerely doubt that there would be any problems with transactions made by a member or coordinator on your behalf, Doha Mums is not responsible for any loss, theft or misunderstanding that might result from these transactions.