Sorry. I don’t have the time to do that, and the best way of learning is doing my friend. So give it your best shot and if you are stuck you can just post another question.
Just start simple, create a blueprint that holds a button mesh with an emissive material. Then add a custom event to “activate” the button. When that event is called, you can switch out the material on the mesh to another material with a different colored emissive, or you create a dynamic material instance and set a different color on the material by changing a color parameter in the material.
Then you can add another custom event which is the “deactivate” event. When this is called you change the emissive intensity (another parameter on the material you can set when you create it) to 0 so it is not emissive so players know it is not “active” or you switch out the material on the mesh to a different material that does not have an emissive value.
As a quick side-note, for future reference please take the time and add periods and comma’s in your questions and answers. Not having any punctuation in your question and answers makes it very hard to read.