1911 Singer Sewing Machines Parts and Sales in Los Angeles

Hi all,

So I was gifted a beautiful treadle and just recently got my grandmother to show me how to thread it. I can tell that I am having trouble with my tension, but have no clue how to fix it. My attempts at googling help have left me confused and was wondering if you lovely thredditors would be able to give me a more focused answer to how to make adjustments to my new/old machine.