A minor js bug fix (Max $15 Wordpress project)

I have a plugin (which you will receive a stripped down version). It is used to upload a post from the frontend. I want a modification to this plugin so I can add post tag input and custom post meta tag input and a progress bar (with percentage). You will not be able to test the plugin as it will have incomplete function. Thus, you will have to send me the updated js as you make changes and i will provide feedback. A document will be provided.