Hello Nicky,
You won't be able to redirect to a URL through a Microflow I'm afraid, you can use a link button instead (I think this will open a new tab).
If that doesn't suit your needs I suggest building a button that takes you to the desired page in HTML using the HTML snippet widget.
Hope this helps
The ClickableContainer or URL Redirector widgets can do what you need.
For the ClickableContainer:
For the URL Redirector: