Model : TL-WR841N

Hardware Version : Not Clear

Firmware Version : TELEKOM

ISP : TELEKOM

Hello. I have a TL-WR841N / TL-WR841ND 300M Router. I want to open the port 80, but I can't because the Web Management Port is the same (80).
I want to open the port 80, so I want to change the Web Management's Port to 8080.
I changed it, and it tells me to reboot the device.

Reboot Help

Click the Reboot button to reboot this device. Some settings of this device will take effect only after rebooting, which include:
Change the LAN IP Address (system will reboot automatically).
[*]Change the DHCP Settings.
[*]Change the Web Management Port.
[*]Upgrade the firmware of this device (system will reboot automatically).
[*]Restore this device's settings to the factory defaults (system will reboot automatically).
[*]Update the configuration with the file (system will reboot automatically).
If I press "Reboot", I will have to configure my router again (changing name, password, etc.)?
Or it's just restarting, (like turning it off and then turning it on)?
I am scared because I dont want to reset all my router settings like name, password etc and other stuff.