Ah sorry for the misunderstanding! But the good news is: the same rules apply for linking the button to the contact section:
- Double-click on the button to open the element settings on the right
- Click on “Link”
- Select “Element”
- Either enter the element ID directly or use the “picker” and scroll down to the contact section and click on “Contact”.
Hope that helps (and I hope I understand you correctly this time - sorry again! 
)