Hi!
It is the "Label position" attribute. Normally, it is hidden in Style
tab in the control panel. To set this attribute:
1) Activate the "Style" tab in the control panel
2) Activate "Node" Tab in "Style"
3) Open the drop-down list in "Properties" and tick "Label Position".
Now the "Label Position" attribute should appear in the list and you
can adjust the position by clicking the small icon in "Def." column and
dragging the labe in the new position.
HTH,
Kimmo