By default, you have to manually type in to solve the captchas used by target websites. If you want to use captcha services to automatically solve captchas, you need to check Enable Auto Captcha Solving checkbox. Then you choose the captcha service and enter your authentication information. If you want to have a backup captcha service in case of your primary captcha service does not work, you can check Use backup captcha service, choose your captcha service and enter your captcha service information:

Captcha Services

If you want to check balance of your captcha service, click on Check Balance