Reflect button text after a click on dropdown

Hi I’m new here and would like to create a simple dropdown. How can I change the button text after I select an item from the dropdown list?

You can drag a dropdown from the default components and then once place on the page, just select the dropdown or the link within the Overview Panel in the bottom Left of your app, you should then see a menu at the top of the Preview window to open and close the dropdown for editing.