I want to add them in a new thread but I don't have the slightest idea how...
When you're creating a new post, there should be a button towards the bottom of the page that allows you to upload a file. Jpeg and pdf tend to work the best, from what I've seen hehe.
Good luck!
You can also add them to the Gallery or the Downloads section...
Love when someone already asks the question I have so I don't have to wait for a response.