I have it freeze both areas. You have to select a cell that is just below the last row that you want frozen and just to the right of the last column to be frozen. Example, if you want Column A to be frozen, and Rows 1 - 6, then you you select Cell B7.
If you have panes currently frozen on the worksheet, unfreeze it first (I.e., Goto Home on the Ribbon Bar, then View, then Freeze Panes, then Unfreeze Panes (First Option))
You then freeze panes with you having selected Cell B7 by going to Home (Ribbon Bar), View, Freeze Panes, Freeze Panes (1st option of the 3 showing)