How to manage multi-cache

When using a multi-chache and getting to the first point how can I "tell" the device to point to the next one?

From the GPS monitor page, do a Menu, Set Target Location and enter the next stage manually.

You can also do a Menu, Add Waypoint (from the waypoints page) and add the 2nd stage there. Once you've done that, highlight the newly added waypoint, do a Menu, Set Waypoint Location and that will change your navigation in the GPS screen to what you've just set.