Add a link instead of a subpage

You can create a menu button if you wish to direct clients to a specific web address

How can I create a menu button if I wish to direct clients to a specific web address?

If you add a new page in your Content > Structure menu, you can add a link instead.

Give the link a page title and insert the address you'd like your visitors to be directed to and then click on Add it.

Click on the cogwheel on your previously added linked page in your Content > Structure menu to change it. Click on the trash bin icon to delete the linked page.