you'd be better off researching this and finding a tutorial or video you like. It's not a simple matter of just posting a few lines of text in a reply. I would post links if I had any, but from what I've read I probably would never use a nav form (and haven't thus far).
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.
top ribbon>create>forms>navigation.
Like Micron I would not use Navigation Forms as I find it much easier to create my own switchboard.