Edimax BR-6524n Manual page 84

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.
You can click 'Continue' to continue on other settings without restart the
broadband router, however, the changes you made will not take effect
before you restart the broadband router.