If a robot that you add to a Kapplet contains an OAuth input for connecting to a service provider, the Edit Kapplet screen should contain the Configure OAuth Credentials section as in the following example.
Running the Kapplet with an OAuth support (after the application have been chosen) should show a screen similar to the following:
If you press the “Connect” button, an authorization process will be initiated (in this case towards Dropbox) asking the user to grant access. Having completed that flow, the Connect button disappears. To see the authorizations stored for the user, you can use “Settings” in the main menu.