What is the http thing? New Google Chrome issues for listings

[healingdojo]

I have no idea what this http content is, I used the I ways link and that makes no sense to me. When I post I take pics and put it directly on the listing, no photobucket or whatever, then I type up a description. How do I check for these http things, find out what they are, and fix them? Please, I know absolutely nothing about computers. Thank you