How to the the standard lens off my konica minolta dimage a200

Sorry, the lens is fixed onto this camera. It's not possible to change it.

BUT there is a solution; you can but a small lens to screw into the front of the existing lens like a filter.

There is one to get better close ups (super macro I s'pose) and another to get better telephoto.

There's a page about them in the hand book somewhere near the back. Gives the Konika part numbres and so on.