Armando is trying to connect Wemo to his wireless router, but when he connects an additional one, it won't take his password. Leo says 2.4 Ghz is extremely congested now, so Leo recommends going into his router settings and changing it to allow his router to make changes automatically. That will enable it to choose the best channels. Doing it manually is tough and he'd need a Wi-Fi analyzer to do it. If he wants to do that, InSSIDer is a good one.
Wemos use channels 1,6, and 10. So he should put the other devices on the other channels. This is one of the reasons why people are turning to mesh routers. They handle connections more effectively. He can move to 5 Ghz, but that's a temporary solution since more people are going to move to 5 Ghz, and he'll be back at square one.