Html5 help needed, Can't fathom the inline and div elements : [Code screenshot][1]


[Website screenshot][2]


  [1]: https://i.stack.imgur.com/6g0g4.png
  [2]: https://i.stack.imgur.com/KG0nW.png


I'm trying to put the mailing list button to the right side of the address. I am just starting out and this has frustrated me for many days. I have been learning using the W3 school but can't quite work out how to move it. At first I was using divs but then learned more about the span element. I thought that would fix it but alas, I need help. 
Just to make sure I am understood, I am trying to have the mailing list button and input to the right hand of the Visit our warehouse text rather than have it below.