First of all we must create the DropBox APP. See tutorial
We place the App Key and App Secret in the panel field. Save changes and click “Connect to Dropbox”
If we are not logged into our DropBox account, it will ask us to log in.
Some confirmation windows will appear which we must accept.
You will be redirected to the theme panel confirming the connection to Dropbox. With this you will be able to import the applications.