I deleted the host name I had to the laptop by mistake before

Now I just have the one to my stationary in the dynamic DHCP client list.
I can ping from both the laptop and stationary just fine. Problem is I can only access the d-link admin page from the stationary computer now. Worked on the laptop before, but I'm not able to login now.
How do I fake the the MAC address?
I use dynamic DHCP btw