Popup window

Hello! I'm sorry, I just have a few problems/questions about pop-up windows:

When I open this pop-up window on the home page, the position of the window is okay, but when I open it on any other pages, it goes to the bottom of the page. I'd like to add the same pop-up window to the words "Work with us" on the home page at the bottom. Can I use the same codes to do that?

• *I attach screen shots
  
  **w:https://fuchsia-circle-s8mg.squarespace.com/config/pages
  p: Sspace24

Can you check it again? Currently no popup appears when clicking Work

Yes, so that popup window appears when clicking on the 'Contact Us' button in the header. However, there is a problem with its position. It appears in a different place on each page.
And I would like to make the same popup window for the 'Work with Us' button.

I created the popup window using code that I found here on the forum, but when I follow the same steps for the 'Work' button, the popup window doesn't work. So, I am trying to understand what I need to change in the code to add the same popup window.

Can you share link to post where you see the code? Currently when I clicked Contact >> It opens new page only, no popup.

Yes, of course:

Let me send a new guide, use content from a Not Linked Page, it will be easier