Hi,
Some general answers ( i dont know anything specific about your card or provider):
There is an option in the muxes tab to "add mux manually" . YOu can fill in the details about the mux you want to add there.
The settings depend on the settings used by your cable provider (one way to check is to use the information-screen on your regular tuner, sometimes this contains the information you need). If unsure, just fill in the frequency, symbolrate and QAM-constellation and set the rest to auto.
However, in the example you post it says "muxes awaiting initital scan 156 "
It appears one mux is scanned, the other are not. Did you wait long enough at some point to at least scan all muxes?
( btw: 157 muxes seems a lot to me, or is this normal for your provider? Otherwise start clean by deleting all muxes; You cant add a mux manually at a frequency if it already exists, and with 157 muxes there is a chance is does....).
Alex.