Once you have navigated to the Binder section of your event, select "Add Folder" to create your first folder.
You can name your folder and add a description, as well as upload your first file to your binder.
When you return to your Binder later, select the "Show" button next to the folder you wish to open.
From there you can click "Add File" to add more files to the folder. You can also view any comments posted to the folder on the right hand side.