How to input altitude in flight plan

When I try input altitude in flight plan it not changing the value of altitude. It pope up WAYPOINT INFOMATION. Here is what I did.
FPL->FMS(Toggle Select Cursor to ALT ____FT) then turn small knob.
I am expecting input ALT value instead it pope up WAYPOINT INFOMATION. What I did wrong? Or it is a bug.

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