BT-default tracker
From MLDonkey
By default mldonkey will create a .torrent file that uses your IP address as the tracker , to use an alternative enter its IP address or URL here
Make sure you specify the port at the end if required , it should match the BT Tracker Port entry.
For example , mine is :-
tracker.collective-b.dyndns.org:11006
To use The Pirate Bay tracker :- (I`ve not tested this yet)
tpb.tracker.thepiratebay.org/announce