How to move a plane - solidworks

Question

I am going to mirror some features, and thus I am trying to create plane in the middle of the design. When I go Features>Reference Geometry>Plane , it asks for 3 points to select in order to construct the plane. However under First Reference tab, there is no option for Offset distance. According to 2011 Solidworks Help, that option should be available. If it was available, I was going to use offset to put the plane in the middle of the design.

Do you know what the problem can be? Or how can I give an offset to the plane after creating it? I do not want to move it by hand. It is not accurate.

Here is the solidworks 2011 screenshot:

Answer 1

One can select a surface to create a plane rather than selecting dots. My problem was due to selection filters, I could not select a surface.