I want to control the outlet on web browser.  But it does not work when clicking the [save] button after I check the [reboot], no matter what browser I use.

As you want to reboot the outlet, check the [Reboot] and click [Off], the outlet will reboot.

For different situation, the way of reboot could be different option: [System after AC Back], [Wake on LAN], and [Kill the Power].

To use the setting, please refer to the page 35 of the user manual, and the video below can walk you through.