Unable to add MissedApproachLeg CA

Hi All,

after a weekend of trying to learn how to add approaches to a brand new airfield just north of KLSV - I've hit a wall. In trying to add a "MissedApproachLeg CA" type, it is blank and the "add" button is grayed out. See attached snippet. I've tried to create a number of types of approaches - both with and without an ILS. Stuck.... any guidance is very much appreciated.

NOTE: P3D v5