Header image. button link and position

How to change the button link to another widget other than #primary
and when I use this button there is a problem with mobile devices, the button disappears behind the following widgets? Can you help me?
Tks you

Duplicate topic: Header image : pb with the button mobile device

sorry I don’t understand your answer. I try to go to the link and and I always come back to my message? And are you sure the the topic answer to my first question?