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Welcome!- What region are you located?
FYI:
Be aware that there are differences between Static and Reservations. A static IP address is an IP address that is configured on the client device and a IP address that is set outside of the default IP address pool, i.e. 192.168.0.100 thru .200 which is D-Links default pool range.
IP address "Reservation" is an IP address that is set up and configured ON the router for a particular client device while the client device is set for Automatic Obtain IP addressing which when the client device is turned on and connects to the router, will get the "reserved" IP address each time it's connected.
The new UI uses auto detection with connected client devices to see whats connected and displays this in the Clients section of the UI. When the device is on and connected, a icon should appear in the list of connected clients. Select the gray pencil icon on this tab and it will display the current information regarding what the router detected and the current assigned IP address lease for the device. In here is where you can edit the name of the device, change the IP address, enable schedule, and enable Parental Controls for the device and enable an IP address "Reservation". I believe that inputting a MAC address is no longer supported as the router automatically detects MAC addresses on connecting devices and displays them in the editing window and connected clients icon tabs.
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DHCP