In order to change settings and apply modifications, you need to press on the Settings tab on the upper right option of settings as shown:

On click, you will now see a new page that show you the Settings as shown

On this page, you can apply any of the changes as described below
Threads | Set the number of working threads (more = faster, but also more resource intensive) |
Timeout in milliseconds | Set after how many milliseconds a test should be canceled. i.e.: for setting 3000 means it will take 3 seconds to cancel a test. |
Limit Backlinks per URL | This will allow you to change the number of backlinks to be generated per URL, i.e., from 500(by default) to 50 |
If you have done any of the changes, you need to save theses changes by clicking on Apply Changes button as shown:
