If you guys are having trouble uploading images, make sure that there are no special characters in the file name, i.e. !,@,#,& or spaces, etc. These do not translate well in web browsers.
See this page for tips on filenaming conventions: http://htmlfixit.com/tutes/tutorial_HTML_File_Names.php
Also, be sure to resize your images to something that's under 100k and a reasonable resolution for display on a web page. Large, inline images will distort the page layout.
Attaching an image to a post, rather than trying to make it inline is also more straightforward. When creating a new post, simply expand the "File Attachments" section, browse for your local file, and click Attach.
You can always go back and edit (or delete) a post you've previously written.
Let me know if y'all have questions or describe to me the scenarios that're causing you trouble and I'll do my best to explain them here, for everyone's benefit.