Fotigate 60C equal cost load balancing

OK!There are two internet links.Customer wants to use both links concurrently.According to the network diagram, one is WiMax and another one is ADSL.Both links have been subscribed to same ISP.
How do you do equal cost load balancing on Fortigate firewall?

First of all, assign ip addresses on network interfaces.

Second step, create static default routes for internet.
In equal cost load balancing, the distance of both routes must be same.

In this case, the distance is 5.

Now we can check the routing table.