I'm thinking you just need to add the calls of the stations being monitored using the link associated with the field for putting in additional monitored stations. I've had to do a few of those and they showed up right away afterward and I was able to select them from the pop-down list after typing in the first few letters.
Overall, using Firefox and Edge as my browsers, I've had pretty good success with each of the various aspects of this thing except a couple of FRN associations in CORES required some finagling.
I did learn that stations whose FRN changed since last year due to sale required basically all the information to be put in again. I had seven of those in my twenty-three stations. Otherwise the pre-population of the fields for our stations that didn't changed saved a ton of time.