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adding extra notes into a song & shifting bar lines

Thanks, everyone for your help w the repeat signs.
There's one other thing that i can't figure out.
Let's say i wrote 5 measures in 4/4 time. the program automatically counts out the measures, put s in the bar lines according to the # of beats.  If i want to add a few more notes to one measure and make the barline shift to the right by a few beats (less than 4 beats), i can't do it cuz it just adds a full 4 beat measure.
What i had to do was rewrite the entire song note by note otw i have extra rests/beats that i need to account for. 
Hope that makes sense.
a real pain.
Can someone please teach me how to shift the bar lines and make it apply to the rest of the song?
Thank you so much!