Hi
To INSERT images
Place your main video on video track 1.
Move the red cursor line to where you want the first image to appear.
Click the scissor icon under the right hand preview pane, (split the track).
Drag and drop your first image onto the main video track where the split is. Your image will INSERT into the main video.
Repeat for the remaining images.
Note that with this method, your video will play completely but with gaps in both sound and visuals where you have inserted your images. (i.e. The overall duration will be increased by the duration you have set for the images.)
If you want the images to OVERLAY the main track then follow Borate's outline or simply add them to video track 2(drag and drop is easiest) and then move them along to the place you want them to appear. This way they will play as CUTAWAYS and not inserts. i.e your video will stay the same length. As images are not usually associated with any sound, there will be no gaps in the soundtrack.
Nat