Boy am I the wrong guy to ask. But I'll try. Click on the browse button on the bottom right and to find the picture you want, click open then upload. That will put it in the manage current attachments box. Open that box and click on the plus sign. Oh yeah, make sure your cusor is in the place you want your picture to be. Then add post or preview post. I hope this works for you. I keep having a heck of a time losing them.
Tom