1) sign up
goto http://2captcha.com
and register
2) Add money to your account
https://2captcha.com/pay
Payment with WebMoney ( WMR - RUB )
Payment with WebMoney ( WMZ - USD )
Payment with cards Visa/MasterCard/Eurocard (Billing in RUB!)
Payeer, Paxum
Payment with Payza or VISA (accept within a 24 hours!)
120 alternative payment options processed paymentwall
PayProGlobal (PayPal, VISA, MasterCard, Amex and other. Payment credited 15-60 minutes)
AdvCash, BitCoin, BTC-E, e-coin, PerfectMoney, paxum
So there are lots of options (each option is a payment company). So probably you want to pay with a visa / master card option. Then just go through the steps, probably you would need to signup with the payment company, then make the payment.
3) Get your 2captcha API key:
Go here:
https://2captcha.com/setting
4) Copy the API key to the SETTINGS tab of the SCM