Correct - ignore the main iDine site.
As long as the US, CO and UA iDine sites (if I understand correctly you are registered with those three) reflect the correct cards linked to each airline, you're fine.

As you are new I advise you to save your receipts . Once in a while restaurants fail to post properly even though the system is "automatic". The iDine reps cannot process a claim for outstanding miles without a receipt.