@Reaching,

Changing the Wi-Fi channels in the router UI would be best if you are receiving the error that the channel is crowded because of nearby networks. The instructions for how to do so can be found here: Changing Channel and Channel Width on a TP-Link Router.

The error is happening because your neighbors' Wi-Fi is "crowding" the channel that your router is trying to use to send its signal. Think of an FM Radio Stream. When you are between two transmission stations sending data over the same channel(106.7, 97.1), You can often hear a mix of the two audio signals. Your Router doesn't want to sort through all the data going through the default channels, so it requests that you select a 'channel' with empty air so that the signal can be as clean and fast as possible.

Let me know if you have trouble selecting the channels for your router.