If you are entering text into a field that is linked to a term list, EndNote finds the first matching term in the list and suggests that as the term you want to enter.
The suggested text appears highlighted after the cursor. Continue typing until EndNote suggests the correct term, and then press Enter Return or Tab to accept it. (Enter Return creates another line in the field so that you can enter more author names; for example, Tab moves the cursor to the next field in the reference.)
When EndNote suggests a term, you can use the Up or Down arrows on your keyboard to have the suggested text change to the previous or next possible matching term in the term list.
When you enter a term that is not already in the term list, it appears in red to indicate that it is a new term. When you close or save the reference, that term is added to the term list and will no longer display in red.
These term list features may be turned off. To turn off the display of red text, turn off the preference to "Suggest Terms as You Type." See Term Lists Preferences.