To open the Chord dialog, double-click on an existing chord  :
 
 

	Here we are creating a A# chord, explicitely specifying that it should be played at the 6th fret (note that based on the chords the program already knows, this is automatically calculated).
Here, we've added a capo to this A#m at the 5th fret.
	The big thing here ! We're creating a custom chord, fill out : the name that will appear on top of it then each absolute position of the fingers.

 
 Clicking on OK will update the selected chord.
 

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