Edimax Technology BR-6574n - Manual (Page 51)

Please click ‘Apply’ to save changes in this page, or you can click
‘Cancel’ to discard all settings in this page. After you click ‘Apply’ button,
you’ll see the following message:
Please click ‘Apply’ to save changes you made and restart the broadband
router, this requires about 30 seconds and the broadband router will stop
responding (this is normal and is not malfunction). You can reconnect to
this broadband router and continue on other settings later.