All you need is the instance of the Combobox: then you can just access the Text property.
The documentation shows you how:
ComboBox.Text Property (System.Windows.Forms) | Microsoft Docs[
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Then it's just display that's needed - and that's dependant on how you want to see it: TextBox.Text is one way, MessageBox is another, but there are probably hundreds of ways to display information!
And then there is when you want to do this: when a button is clicked, when the ComboBox is changed, on a timer ... again there are many different ways to do that as well.
So think about what the task as set is asking you to do and work from that - we can't see your homework assignment, so we can't be specific.
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