I am on the "any changes" startying page. how do I add a company that I started?

[LinaJ2018]

If it is a self-employed business, you would add another Schedule C.  

• To the right upper corner, in the search box, type in “schedule c” and Enter
• Select to Jump to schedule c
• Follow prompts

If this is a corporation related, to add, you would need a separate program.  Click here https://turbotax.intuit.com/small-business-taxes/.