Mark,
There are a couple ways of doing what you want. Try this one:
1. Place your clip in the time line
2. Place the timeline marker on the frame you would like to freeze
3. Cut your clip at that frame
4. Right click on that frame and choose “Frame Hold”
5. Choose the “In” frame option
depending on how much video you have after your cut will depend on how long you can display your freeze frame.
6. right click on you clip again and choose “speed/duration”
7. un-link the two options by clicking the chain link
8. enter 5 secs for you duration
If you get a flicker in your freeze frame, you may want to right click on the freeze frame clip again and go into the “field options” and choose “flicker removal”
I hope this helps.
Fritz Sticht