Help Please...Can't access via LAN IP

Hello,
I hope someone can help me figure this out. I am using Mikrotik firewall version 2.6. It has been workin fine but recently I went into it and made a change in one of the policy rules. Before I made the change (when all was good) this is what the rule said...

Src. Address: 0.0.0.0/0
Dst. Address: 0.0.0.0/0
Interface: all
Flow:
Action: lookup
Table: Main

this is what I did.... Interface from all to WAN

Src. Address: 0.0.0.0/0
Dst. Address: 0.0.0.0/0
Interface: WAN
Flow:
Action: lookup
Table: Main

Right after I did that the router disconnected and since then I have not been able to access it. Honestly I am not quite sure what the change I made did. Did I basically change it so that it will only accept WAN traffic? I am now unable to ping the LAN IP 192.168.100.254. I get no replies. I also tried to access it via the public IP address from a different location and still nothing. Can anyone tell me what commands I can use on the machine itself to change the interface from WAN back to all?

Enter via serial port..

Update the system next..