I cant put marker on the map

I need to put marker on the map
I’ve read all the previous posts and check them all but none of them solved my issue
can anyone help me solve this out?

Hi, maybe the example “MarkPoints” in the examples can give you some ideas. https://www.mapwindow.org/mapwingis/_mark_points_8cs-example.html. Good luck!

H read this
but the source code and the class seems to have critical issues
can anyone help me?