Help lengthening section

[frisbie9]

Hi, I've been unsuccessful looking around trying to find out how to extend a section of a song. I'm trying to add a few bars to a verse section. I know how to duplicate, and i've tried the "shift" function and then dragged the section to the empty space but it's not "pushing"/lengthening the track, ie inserting without replacing.

I've spent way more time creating and trying to up my edit skills, so I'm sure this is newbie-esque question. Thank you!