What kind of boxes are these? Static text? Form fields? Comments?
What tool are you using to edit them?
I'm sorry. I'm so new that I don't know what kind of boxes they are. I'm using Adobe Acrobat from the Cloud. I'm editing another teacher's flash cards for a game. Is there a way to upload the document to show you?
Maybe it would be easier to just create my own? I'll watch some tutorials to learn how to do that, if so. I hadn't anticipated using Acrobat, so haven't spent much time learning it.
Maybe it would be best to use Pages. ?
Ask the other teacher from what file format they created the PDF, and whether they still have access to this file. If so, it's much better to edit the original file and then create a new PDF from it than trying to edit the PDF directly.