Question about firefox and internet and craig's list

[Cbshahji]

I honestly didn't know where to put this so here it goes

I'm seeing lot of seller putting their item on craig's list with bigger and colored text and putting big images right under where they put the information and i can't figure out how to do it it will be great help if someone helps me out on understanding and showing me how to do it.

Thanks
CB

 

[Peteman100]

They use HTML tags directly in their postings

http://www.craigslist.org/about/help/html_in_craigslist_postings/