You can enter the cash as miscellaneous income by following the steps below.
1.
Select the Federal Taxes Tab
2. Select the Wages & Income Sub-Tab
3. Select Explore On My Own
4. Scroll down the page which should now show a list of available areas to
visit
5. Under the Less Common Income section you should see
Miscellaneous Income, 1099-A, 1099-C; select the Start option to the
right.
6. Select "Other income not already reported on a Form W-2 or Form 1099-MISC"
NOTE: There is a screenshot included below for your reference.