Please see below to link an external link to a button on your website steps:
Go to Website > Editor.
Click "Edit" in which the button you want to add a link.
Go to the Button section > enable the toggle > edit the label as you need.
Select "External" from the link list and paste the external link. (Please remove the #)
- You may choose the "Open link in a new page" option if necessary.
Click "Save."