Using the 737 FMS -how to put in multiple waypoints to define a flight plan

Question

When trying to enter a third waypoint into FMS for the 737 I get nothing but "Invalid Entry."  I'm simply trying to put the third waypoint in on a short route from DFW to Austin.  The flight plan is TTT to WINDU to CWK to BLEWE.  However, on the FPLN page 2, I cannot enter past the second waypoint, WINDU.  When I attempt to enter CWK and then hit 'To' I just get the 'Invalid Entry' response.  Why is that?

Answer 1

For the best help with the default FMS, check out the instruction manual in the aircraft folder, or here on the support page.