Retirement tax questions

So, I need to inform the brokerage I got a K-1 from the partnership? The distributions are still within the IRA with the Brokerage, so I would assume they know about them. How can I determine if the there is Unrelated Business Income exceeding $1,000? I don't see any numbers on the form that are called that. There's a lot of small numbers and a few negative numbers. Is there a field that shows that? I only made about $1,200 in distributions in 2020. I have not sold any shares, I've just received distributions that I have re-invested in more shares.