Hi - can't seem to get an imagine into my blog post - the url is under 200 characters but all that shows up is a blue question mark.  What am i missing?

Sort of weird update - went back and removed the url completely (just to neaten up the blod post) and while there is no longer a url for the image, the image now appears.

is there a way to edit a blog posting?  I've been looking but for the life of me I can't find a way.  Knowledge base says to go to the admin page but I can't find that either.  Any help will be much appreciated!!!