It depends on which track the guitar is one.

if it in the second slot (which was originally the Piano slot), then add a "p".

[X]...bdp

4th slot (originally Guitar) add a "g"

[X]...bdg

5th slot (Soloist) add an "s"

[X]...bps


Also, note... 3 dots will do a held chord on the other instruments (slots). 2 dots will do a shot. If you want a true Rest from other instruments (slots) use one dot.

These can all be changed using the Chord Settings menu option (Alt-F5). As you check boxes and change the "Rest Type" dropdown, you can see the changes appear on your chord screen.