Usage of clipping paths

Though I know that I will come out as an absolute newbee (what I am) I need to know the following.

I bought a graphic which separate objects should be color changeable due to given clipping paths.
Unfortunately, I did not manage to change any attributes of this grafic.
I would like to get rid of the white background and I to change the color of the different objects, but no way.

Can somebody please help with a magic hint?

Thank you!