To add notes while on a call use a Single Input question type to record text. These entries will be available in your script results files in nightly reports or via Past Call Results.

Notes sections can be visible at all times from the start of the call:

OR notes sections can be configured to appear when the end of the script is reached: 

Important Note: "Has other item" options within each question type shouldn't be used at all unless you want to collect simply "other" - any text entered into the other field on any question types won't capture what the people type into that other field. A separate single input question should be used in place of this and should appear after the Other selection is made.