If you're trying to raise pH and KH, try reading here:
http://www.wetwebmedia.com/FWsubwebindex/fwh2oquality.htm
The salt alone won't do it. This mix combines marine salt mix, epsom salt, and baking soda to slowly raise pH and keep it there, due to also raising KH. This article explains the basics on pH and KH as well, and you really need to learn what you're doing and why you're doing it, instead of taking advice from five different people, none of whom care for your fish as much as you do. I'm not saying their advice is bad, but they're never going to be as invested in your fish as you, because the fish aren't theirs. Just take some time and understand what's going on and what you need to be doing to treat.
And your pH may be too low. But the problems you presented with originally were due to the toxic ammonia levels present in your tank.