All you need to do is convert your story into a .zip (via right click on your story then click send to -> Compressed (zipper) folder) then upload that .zip folder to a site of your choosing, such as mediafire, moddb, etc...
I'll just assume you made an account on mediafire, so simply just click the "Upload" button located on the northwest of the page then click on the big plus sign when the window pops up and navigate to your .zip folder and upload that. After that, click on the file, which will take you to a new tab, and copy paste the URL for others to download your story