Mike you have a couple of choices to post pictures.
First, this program has an option where it will let you post a picture directly from your computer. Click the 'button' below the text screen that is labeled 'Attachments and other options'.
That will give you a few more options for your post, one of them is the 'Attach:'. Under that you will see a "Browse" button that accesses your computer and allows you to attach a picture to the post. I usually copy pictures I want to post to my desktop ahead of time, makes them easier to find.
Second you can use a picture hosting website like Photobucket. There you upload your pictures to your album, then get a link which you can insert into your post for them to appear.
The far left button just above the
that looks like a picture in a frame allows you to copy a web-address of a picture and insert it into a post.
I hope this helps, if not call me on the phone and I will walk you through it.