How can I add IDM integration module in Opera?
For Opera you have to enable "Use advanced browser integration" option in Options→General IDM dialog (arrow 1 on the image). Then check that integration into Opera is also enabled (arrow 2 on the image). If IDM shows some error when you try to enable advanced browser integration, please read this instruction.
How do I integrate IDM into my browser?
If you browser is not Internet Explorer, FireFox or Chromium based the only option to integrate IDM into your browser is to enable "Use advanced browser integration" option in "Options→General" IDM dialog (arrow 1 on the image). Then check that integration into your browser is also enabled (arrow 2 on the image).