Reordering responsive

Hi there,

I’m trying to change the ordering within the responsive navigation of the website. Currently when view on an iphone or other the sidebar is posted prior to the content (filtered theme). I’m looking to place the content/images prior to the sidebar/text.

I’m new to the editing side of things but am assuming I might be able to edit and reorder this within the editor.

Any suggestions on where to start?

thanks