The following procedure will help you configure the dvPortGroup's NIC failover order to make the LAG as the active uplink:

1. On the Migrating Network Traffic to Link Aggregation Groups window, click on Manage Distributed Port Groups.
2. On the Manage Distributed Port Groups screen, select Teaming and failover. Click Next to continue.

3. On the Select port groups screen, select the desired dvPortGroup and click Next.
4. On the Teaming and failover screen, move the LAG from Standby uplinks to Active uplinks and ensure that it is the only active uplink for the dvPortGroup. Then, move all of the other uplinks to Unused uplinks:

5. On the Ready to complete screen, click Finish.

You have now successfully configured the dvSwitch and the desired port group to use link aggregation groups.