1. You should have Dropbox account. Create dropbox account from this link https://www.dropbox.com/
2. Login to your dropbox account. In order for you to upload files you need to create a drop-ins app.
To create drop-ins app point your browser to https://www.dropbox.com/developers/apps/create?app_type_checked=dropins
4. After you create your drop-ins app it will automatically forward to your drop-ins settings(for this example we make used of CSRecordings) or You may use this link https://www.dropbox.com/developers/dropins/saver . Under the "Settings" - "Chooser/Saver Domains" field add your Goautodial URL(e.g. goautodial.com or yourcompanyname.goautodial.com or YOUR_GOAUTODIAL_URL.com) by pressing the "Add" button. Take note of the App key assigned to your drop-ins app. You need app key for you to enable Dropbox in your Goautodial web application. You can now go back to http://www.goautodial.com/knowledgebase/71/How-to-enable-your-Dropbox-in-Goautodial-web-application.html and perform step #2.
Below is the link on how to use dropbox(what is dropbox, add/delete/edit/share folder, etc).