On a sufficiently wide-screen device..you get back into your tax return somewhere, then navigate back to the federal tax section by clicking on "Federal" in the left side of the screen, and then make a selection up towards the top of the screen as to what general section you want to go to.
On narrow screen devices (not recommended)...most selections to navigate show up on the left-hand side of your screen AFTER you get back into your tax file....sometimes that requires the clicking on the hamburger stack at the upper-left to get the menu to show up.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*