LACP (link aggregation)

My old router with OpenWRT has gone wrong and I bought the Linksys WRT3200ACM.
Would anyone know to help me with one problem?
From the conclusion that I've a NAS server I would like to use LACP (link aggregation). OpenWRT was configured more easily. I would like to set port 1-2 to be reserved for LACP.
LACP on NAS Servers is set.

Unfortunately, I can't manually configure the router. :frowning:
Thank you very much for your help.