volume control problem

I've got a Trends TA-10.2 integrated amplifier. The volume potentiometer wore out and I tried to replace it. In the process of desoldering it I damaged that part of the circuitboard so that it's not possible for a new volume potentiometer to work properly. The amplifier comes with a jumper system so that the volume control can be bypassed, which I tested and it works fine as a power amp (always at maximum volume level). I have two questions: 1. Is it better to install a gain control at the input, or a volume control at the output? 2. How would you go about installing it?
 
Hmm, a product only a couple of years old, and the volume pot wore out already?
I looked at that..... so-called amplifier.
Cheap plastic pot, class T design? (must mean Trash)
Typical "modern" build quality.
And I use the term "quality" very loosely.

Do yourself a favor, and get a real amp, you'd be much happier.