I'm not an expert. Look for questions in early Getting Started. Did you do this or that? Hopefully something about did you have rental real estate? I have been filing schdl E for some 25yrs. I have no idea how I first started adding it to my interview step by step process.
You can find Schedule E under Income and Expenses and scrolling until you find Rent, or you can use the link below for step-by-step instruction. You can also begin and select 'Royalties' if you need that income.