Region : UnitedKingdom

Model : TL-ER5120

Hardware Version : V2

Firmware Version :

ISP : BT

Hello i am having some issues with multiple ip addresses, lets say i have an IP address of
81.11.11.11

and by putting this in the current bt router itself it will give me 13 ip addresses, then i select the device i want it assigned to ... then which of these static ips that i want it to be assigned to.

How would i do it on this?

Thanks
Lewis.