Feather has a built-in transaction pusher that can submit a raw transaction to a specified node.
Transactions are always submitted over Tor, except when submitted to a local node.
Go to Tools → Broadcast transaction → From text.
In the Transaction textbox, paste the transaction hexstring.
In the Node groupbox, select whether to submit the transaction to the currently connected node or use a custom node.
Click Broadcast to submit the transaction to the node. It may take a few minutes before the transaction shows up in the History tab (if it belongs to the currently opened wallet).