I have two separate single member LLCs - I've done all the entries for one but I cannot find where I can start the 2nd and still be within my personal tax return.
You can just type Schedule C into the search bar at the top of your return and it should give you a JUMP TO link to go directly to it.
To add another business or Schedule C….
Go to Business tab-Continue
Business Income and Expenses
Profit or Loss from Business, click Start or Update.
You should see the Business Summary page that lists your businesses, right below the list you can Add Another Business.
Be sure to add it under the right spouse if you are married.
See the screenshot on this post