Apple Final Cut Pro 6 - Manual (Page 399)

66 Part I Organizing Footage and Preparing to Edit
2 In the Edit Marker dialog, enter a new start time in the Start field, then click OK.
To move a marker in a sequence by entering a new timecode value:
1 In the Timeline or Canvas, move the playhead to the marker.
2 Do one of the following:
 Press M.
 Click the Add Marker button.
 Choose Mark > Markers > Edit.
3 In the Edit Marker dialog, enter a new start time in the Start field, then click OK.
Aligning Items in the Timeline by Their Markers
You can move a clip item in the Timeline by dragging one of its markers. When you do
this with snapping turned on, the marker becomes the clip item’s snap point. So while
you’re dragging a clip item by one of its markers, its In and Out points won’t snap to
anything. This allows you to quickly align markers in sequence clips to each other, or to
markers in your sequence.
For example, suppose you have a sequence that contains a shot of a person dropping
a glass and an audio clip of jarring music. You can easily align these elements to
a specific point in your sequence by adding markers at the relevant points in your
sequence clips, and then dragging each sequence clip by the marker with snapping
turned on.
Enter the new time here.