Exactly placing of connection points.

I would like to add some connection points to a custom builded shape and it is important for me to place them exactly at special places within the shape (not only on the bounds or at the center of the bottom...) The points I''ve created are always along the borders of the shape (equidistant to each other) and not at places I want them to be. I guess I did something wrong. How can I do it properly?

Dear administrator, please remove this topic. I''ve finally found the "Symbol Designer" tool. I apologize for being so inattentive.