wst, insert VOR 1 & 2 frequencies at the top of RAD NAV page with separate CRS for the outbound and inbound. Select VOR 1 & 2 on MCP as appropriate. You can always flip between VOR and NAV so that in NAV mode you can see the VOR course pointing to the rear on the outbound and forward on the inbound, while checking you are on track in VOR mode.
Also see FCOMs for more details.