Is the particular wifi SSID "hidden"? SeeStar has no way 'seeing' those networks and no way of entering SSID manually for those wifi networks that have hidden SSID.
I had to reset my router to factory default and allow broadcasting the SSID. I also had to resetup every other device that was using the hidden network name. Not very thoughtful on the part of SeeStar to cause a user such frustration.
Hidden SSID are hidden for a reason. Privacy and/or security.