How do you switch from paper space to model space

I am an autocad user, so when came to creating a layout, from which to plot my drawing, I have really come unstuck with with draftsight. I've tried the video tutorials but don't seem to be able to view them. The help does not seem to cover this at all well.

I have created a layout, and set the plot window, now I want to resize and position the drawing in this window. I will then need to know how to access plot set up and how to plot to PDF file.... Can anyone help???