Trying to setup DHCP and a manual (static) DHCP address

The MAC address below was made up for this example; I used my actual MAC address for testing.

I tested with and without bootp automatic as set by the WEBGUI.

This is a proof of concept configuration (that may be published) not the actual configuration I will eventually use when this is complete.

Side question can the net-bios line be removed without consequence? (I believe this is a recommended security precaution by some)

My Switch is firmware version:

!System Description "Dell EMC Networking N2024, 6.7.1.22, Linux 4.14.174, Not Available"

My current DHCP settings are:  (there are additional for vlans 41- 48)

service dhcp
ip dhcp excluded-address 192.168.1.0 192.168.1.143
ip dhcp excluded-address 192.168.1.160 192.168.1.255
...
ip dhcp bootp automatic
ip dhcp pool "VLan1"
lease 0 0 30
dns-server 192.168.1.254
default-router 192.168.1.253
network 192.168.1.0 255.255.255.0
domain-name MyPrvNet.localdomain
sntp 192.168.1.254
netbios-node-type b-node
exit

...

I try to add a manual (static) DHCP entry as follows:

When I  press apply I get:  (I get this alot and it is not helpful at all). 

UPDATE: This problem appears to have to do with the browser.  I tried it with chrome and got an error message about 

Error! Invalid String:Unable to set 'Client Name' with ''

Is the client name supposed to be the host name without the domain part?  I tried enterning MyMachine in the client name box and got the same error message.

I performed the task from the console as follows:

Switch253(config)#ip dhcp pool MyMachine

Switch253(config-dhcp-pool)#hardware-address 01:02:03:04:05:06 1

Switch253(config-dhcp-pool)#host 192.168.1.1

Switch253(config-dhcp-pool)#exit

I validated the results in the WEBGUI and tried to update the lease time to 18 hours:

I got the same empty WEBGUI error window as before (not shown)

I went back to the console and completed the update as follows:

Switch253(config)#ip dhcp pool MyMachine

Switch253(config-dhcp-pool)#lease 0 18 0

Switch253(config-dhcp-pool)#exit

I validated the results in the WEBGUI:

There appears to be a problem with the WEBGUI.

Is this the proper process for adding a DHCP entry to assign an IP address to a specific MAC address?  Is this vlan sensitive as in selecting the correct IP address for the requested vlan?  If this is correct, what you call a static pool is more like a static address because there cannot be multiple ip/mac address combinations in a static pool.

Thanks