1) Open customize+
2) New profile -> click the Enable check 
3) Edit profile -> Enable Mirror Mode + Preview + Show Live bones 
4) Change mode from scale to Position or Rotation (you can use both at the same time but you can only edit one at a time)
5) Scroll down to the drop down for earrings 
6) Edit the values for Earring A Left or Earring A Right (With mirror mode enabled this should move both sides at once). You can do this by clicking and holding on a value and moving your mouse side to side, or double clicking to edit it manually 
7) Reposition your earring
8) Save and Close -> Save and Close (again) 