the easiest way to post an image is to reference an image that already exists somewhere on the web by including the following text in the blog:
img alt="mudbrickbuilding.jpg" src="http://www.peacecorps.gov/wws/letters/mali/images/mudbrickbuilding.jpg" border="0" /
with the entire text surrounded by the greater than less than characters at each end (i can't include them above because they would produce the image). example below:
< all that text stuff with img and alt above goes in here >
"img alt=" refers to the name of the file
"src=" indicates the location of that image on the web
the above will produce the following image:
if you want to post your own image, you will have to locate it, via ftp, on a public server.
