1. Load ImgBurn
2. Switch to 'Write' mode.
2a. You can do that via the 'Write image file to disc' button on the 'Ez-Mode Picker' screen.
2b. Click the 'Mode' menu at the top and then the 'Write' option.
3. Insert blank CD/DVD/BD (depending on image size!)
4. Select a file to write by clicking on the 'Browse for file' button.
If you created the image with ImgBurn, you should be looking for a *.CUE / *.MDS file initially. If you can't locate one of tho