how configure ip static adsl

Hello
i connected my adsl modem to eth1 mikrotik
i buy one static ip for it.
my modem ip is 192.168.1.20 and my static ip is 64.79.72.20
i have one pc with 192.168.1.40 that connected to mikrotik.
i want to connect this ip static to this computer on port 3000

how may this?

thanks