Edimax Technology EW-7722PnD - Manual (Page 36)

2-5 Advanced Settings
Click ‘Advanced’ button to show advanced configuration menu. In this
menu, you can configure some advanced wireless settings.
Normally you don’t need to change these settings to establish wireless
connection. Only change these settings when you know what you’re doing and
you really need these changes.
2-5-
1 ‘Advanced’ menu
You can configure wireless frequency and available radio channels here.