Playback in write mode

I’m having trouble with playback. How can I playback from a specific place in my piece. It seems to be out of my control many times starting at the beginning of the piece. Please help, Leslie

Select a note or rest and press P. If you select more than one note or rest, or the whole bar, of a stave, and press P, that stave only will be played back. If you select a couple of things of TWO staves and press P, only those staves will be played back. So the key is P.