Switch from NAV 2 to NAV1 in Boeing 737

[Marc 2 0]

Hi, I want to enter a VOR frequency in NAv2 and a ILS Frequency in NAV1, can somebody tell me how I switch from NAV2 to NAV1 in the Boeing 737. Thanks a lot!

[Marc 2 0]

I mean during the flight after these frequencies have been already entered...