1. Click on Settings
2. Click on Captcha
3. Choose a captcha captcha service that you have previously enabled to be simulated in GSA Captcha Breaker (in this case Anti-Captcha.com)
4. (Optional) You should choose a backup captcha service too which is not simulated (like 2captcha)
5. Enter ANYTHING as key
6. A click on Check Balance should show $999 which indicates that this is a simulated reply by GSA Captcha Breaker who is now accepting and solving the captchas for you
7. (Optional) Click on Google Captcha tab and choose a captcha service here as well. Please note that GSA Captcha Breaker is only solving image captchas, so don't try to simulate anything here. You SHOULD choose a captcha service for Google No Captcha because 1/3 of high authority Web 2.0 sites are using Google No Captcha and increasing.

1. Click on Options
2. Enable the Run as Webserver
3. Select Anti-Captcha.com as a service to simulate. Select that as only option, else it will also pick up any other calls and redirect it to itself.

Attention: Please extra check that firewall on your system and/or VPS is not blocking certain ports!