There are several mistakes in this code:
1. The case is important. It should be MyMap.Get("value")
2. If you are interested in a specific key and you are not sure whether it exists or not then you should check it with ContainsKey:
B4X:
If MyMap.ContainsKey("value") Then
Dim value As Int = MyMap.Get("value")
End If
Another option if you want to be more sophisticated:
Thanks Erel, I will use your suggestions.
I probably should have found that myself, but although I did one project a few years ago I am really a newbie and I can only take in so much at a time.