How to pull Data Into my Template

Hello,

I have made a field “Deal screenshot” which is visible in backend en where i can put in my text. But in which file do i need to add the data so it can be visible on frontend?

You see the tab “Beschrijving” above the long description. What i want is to add the above mentioned also as a tab. Is this possible and how can I do this?

Hope that someone can help me.

The page I need help with: [log in to see the link]