I couldn't get the Wilson links to open either, trying it both ways. I tried to find their information by doing a search and what I found wouldn't open either. They sell coffee intended for enemas, and most people use it. They also give instructions.
Bathtub is the most convenient place IMO. The CE doesn't take alot of coffee, but it needs to be retained for 15 min. If I remember right, the blood passes through the liver 8 times during that time.