Here is a link on tube for your sewing machine how to. There is a short intro and then the full instructions are there.
https://www.youtube.com/watch?v=X1meLXxQA1E
This is a link to down load for the manual.
https://support.brother.com/g/b/manu...d=hf_ls1217eas
Here is a threading guide.
https://www.wikihow.com/Thread-a-Bro...Sewing-Machine
Just google your machine there are pages with good info.
Have fun