OpenBullet is a testing suite of software allowing users to perform requests on a target web application.
OpenBullet doesn't have the option to directly connect to CaptchaAI services, But until they add our services you can use CaptchaAI in solving its Captchas.
Before you start you can check how to start if you need to learn more about CaptchaAI.
First, you need to Log in to your account on CaptchaAI to get your key from here https://www.captchaai.com/api.php
In OpenBullet Software, Choose "Captchas" Settings
Then choose "Custom 2Captcha Server Option"
Add Your CaptchaAI API Key | Domain | Port
API Key: Paste CaptchaAI API Key
Domain: ocr.captchaai.com
Port: 80
If All is Done, It should work normally
Just Run the software and The captcha will be solved through CaptchaAI services.