For anyone to help you, they have to be able to look inside the project to see what is going on.
First, you can't change it unless you can open the .story file in Storyline.
Open it in SL, choose File, then Save As... That will open a dialog box asking what to name it, but will also show you where it is going to be saved. That location defaults to the current location, so you will be able to find it.
Come here (with a computer, not a phone), click the Add Attachment button below, choose Browse, navigate to where the .story file is, select it, and click open. Then click Post Reply, and it will be uploaded.