In the section Entries > Text field or Terms > Text fields you can create and edit text fields of the respective level (Term/Entry).
A text field is a field in which free text can be entered.
The initial crossTerm instance Default Across Server is already prefilled with text fields at term level. Upon creation, new crossTerm instances are empty and first need to be filled with the desired text fields.
Click Add to create a new text field. By activating the individual options under the input field, you can determine that terms in which the particular text field appears are to be marked with the icon.