Force destination IP address through on of two WANs

hello all;
I have one LAN and two WAN address .
This two WAN are link aggregated .
I want to force all traffic from LAN to “google.com” across through WAN1.

thank you before .

Can you post your config?

Do you use firewall mangle?

Or you can read http://wiki.mikrotik.com/wiki/Policy_Routing_in_RouterOS_2.9.x

hello ;
Yes , I use firewall mangle to link aggregation .