Hey Thomas,
What you’re trying to do is indeed not too difficult, but you’ll need to write some code.
You need to create a onChange event handler for the dropdown that looks something like this:
import wixLocation from 'wix-location';
// the above line must be at the top of your code
// you need to connect this function to your dropdown using the properties panel
export function dropdown_change(event, $w) {
$w("#dataset1").setCurrentItemIndex(event.target.selectedIndex)
.then( () => {
wixLocation.to($w("#dataset1").getCurrentItem().url);
} );
}