Anyone familiar with using flyzed.com or flying SA using zed in general?

zed.com:
I can log in and check flights. I get a smiley to frowning face. I can see how to list.

I see that I can find out how much a zed fare costs on UAL's intranet site.

Why don't all flights show up when I try to figure out the cost on UAL's site? As an example, on zed I can see multiple direct flights from HKG to KUL, but on UAL's zed fares calculator it tells me that there are no direct flights. WTF?

How do I figure out which flight is in a low, medium and high zone?

Where do I pay for the tickets? Does it work like an ID90?

Any other tips and tricks?

Thank you in advance.

Andrew