Start forwarding bugs
In the top-right corner of your Dashboard click Settings .
Choose Apps in the top navigation bar, and expand the app whose bug reports you want to forward.
You will see various integrations listed there, with their appropriate Connect buttons. Click the one you want to forward bugs to and follow the instructions.
Stop forwarding bugs
If you want to stop forwarding bugs, that's also done from the Apps page in Settings. Expand your desired app and just click the Disconnect button next to the integration you want to disconnect. That's it, bugs won't be forwarded there any more.