You need to found your bughouse partner at first and then make a seek. I use Babaschess so I'm not sure how it works in Thief, but in Babaschess you have buttons for every function needed for bughouse. For more info read http://www.freechess.org/Help/HelpFiles/bughouse.html or use bughouse channel on fics
HELP PLEASE!
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I cannot for the life of me figure out how to play bughouse on freechess.org. I downloaded Thief and the thing said "Challenge accepted but the board was still empty. It doesn't let me put out a seek either. I don't get a reply when I ask for help. What do I do??