I was able to carry out a search and according to the manual, this is exactly how it should be done. According to the manual: Click on Router. Then enter the following information before clicking on Apply:
IP address: Enter the new IP address of your router. Subnet mask: Enter the subnet mask IP address DHCP server: Activate the DHCP server DHCP IP pool: Enter the start and end IP address for your DHCP. DHCP time: Enter the maximum lease time in hours.
Unfortunately, it is not written why DHCP should not be adjustable. In this case, I would recommend contacting the manufacturer directly. I am also releasing the question again, as someone may have this router and would like to share their experience with us.
