This puzzle is a design puzzle with symmetry. You fold one copy of the protein and the other fold exactly in the same way. The usual advice is to fold the copy apart and to join with the other after a while. To fold the copy you may begin by assign a structure (helix, sheets, loops) and rebuild then mutate a segment (M) and mutate all (Y). If you have lost your protein, type q or home-key and unzoom. You may find easier to fold in selection interface. To move the copy, use the move tool : left button to ritate and right button to drag.