How do I Create Windows & Doors on 2017 Make Floor Plan Top view

I have done a Floor Plan with room dimensions on a block but can’t find how to erase some of the wall or add something to create doors and windows. It is from the Top Camera view that I am working on in Make 2017.

If it has groups in it then you need to select the group before erasing.

It would help if you posted your file as there is a lot left to guess about here.