Default Unanswered questions - basic design flaws with phone?

When I am on a call and then receive a call, it lets me swap them. How do I merge them? How do I end only one of the calls? When I make two calls, how do I swap them instead of merging them? How do I hang up on only one of them? When I call more than one number and then merge them, how do I afterward only hang up from one of them and keep the other one on the line?

Sent from my Galaxy Note III; Previous owner/hacker of Galaxy S III, Galaxy Nexus, Droid X, HTC HD2, HTC Touch Pro 2, HTC Tilt, HTC 8525, O2 XDA II, O2 XDA.
- R. Kruse Ludington

Current: Galaxy Note III Black; Previously: Galaxy S3, Galaxy Nexus, Droid X, HTC HD2, HTC Touch Pro 2, HTC Tilt, HTC 8525, O2 XDA II, O2 XDA