2 WAN config help

Hi,
I dont have any experience in scripting on mikrotik so i need your help.

I have created PPPOE connection with mikrotik and my modem in bridge and got the internet. Modem address is 192.168.1.1 and address on lan adapter is 192.168.88.1
In the house i have another ISP router and i want to add it to my config.

So i need script which will:

add secondary ISP(192.168.1.254) to current configuration and route all tcp traffic to that ISP