- Download chromedriver/geckodriver for your current chrome/firefox version.
- Copy paste the driver in your Openbullet\bin folder.
- Start Openbullet and configure your path and stuff in Openbullet -> Settings -> RuriLib -> Selenium
Now you should be able to use selenium if not check the log in debugger you should get a exception message which you could copy and paste here for further help.
You do not need to install Selenium.
Selenium is already included in Openbullet you just need to set it up with the steps above.