The following procedure will help you map vmnics to the LAG ports:

1. On the Migrating Network Traffic to Link Aggregation Groups window, click Add and Manage Hosts.
2. On the Add and Manage Hosts wizard, select Manage host networking. Click Next to continue.
3. On the Select hosts screen, click Attached hosts... to add the desired hosts. Click Next to continue:

4.  On the Manage physical adapters, click Assign uplink to map the LAG ports to the vmnics. Then, click Next to continue:

5. Skip through the Manage VMkernel adapters and Migrate VM networking screens by clicking Next.
6. On the Ready to complete screen, click Finish.

Once the physical NICs are assigned to the LAGs, the next step is to reconfigure the dvPortGroup with LAG as the only active uplink.