Please improve installation instructions

I’m trying to create a bootable USB stick for Ubuntu. I am following the directions given on this page .
When I get the following popup when I click start while using Rufus. ‘The image you have selected is an IOSHybird image. …" The message gives me a option (pre-selected) "Write in IOS image mode (recommended) or 2) write in DD image mode. The instruction on the linked page (above) did not mention this popup and gives no advice. Can this site be updated to include advice on this popup? Thanks.