You are going to have to enter this on Form 1040 Line 21 as Miscellaneous Income.  Give it the name Not for Profit Garage Rental

• Click on Federal Taxes
• Click on Wages and Income
• Show All
• Scroll down to Less Common Income
• On Miscellaneous Income, 1099-C, 1099-A, click the start or update button

On the next screen, at the bottom of list, Other Reportable Income, click the start or update button

On the next screen click on Yes

On the next screen enter the description and the amount.  Continue with this section until it completes.