Are you trying to upload your story in the image box, by any chance?  If so, only an image can go in that box and must be the size specified.  You can have the system generate a thumb, if you choose.  I believe there is a check box for that.

Your story must be entered in the Comment box further down the page.  You can copy and paste it into the box.

If you have no image, leave it blank, and just put your story in the comment box.  You can have the system generate a thumb, if you choose.  I believe there is a check box for that.

After you upload the story, you can edit it if you need to.  The edit button is on the your gallery page for the story.

Don't give up.  You will get it up, it just takes a little time to get used to the way it is done.

“Music is harmony, harmony is perfection, perfection is our dream, and our dream is heaven”
Henri Frederic Amiel