No problem
Say you want to search the 1891 census for example. You select 1891 census and get a blank screen with fields in which you put names/birthyears/birthplaces etc of your ancestor
That is the input screen
Ancestry introduced a dreadful "new" search facility which complicates searching which is why I asked what colour the screen is.
If it's cream - it's the horrible new search so we need to get you to the "old" one which is green and then we can answer your query properly for you