If you're referring to rests in a pickup measure which is shorter than the normal measure length, you need to set the length of the pickup measure. I don't use Print Music (I do have a copy somewhere but not loaded), but in Finale Guitar that's done by selecting the Pickup Measure command (Options/Document Settings/Pickup Measure) and setting that to the length you require for the pickup measure - the suplus leading rests will disappear.

To hide rest in the final bar you can use the Speedy Entry tool, select the final bar with it, position the cursor on the rest to select it and press the letter O or H to hide it. (Again I'm assuming the same facility is available in Print Music as in Finale Guitar. If not look for Hiding notes and rests in the help index to do this).

Mick