You can attach chord names to notes and rests. To do this make sure NtEd is in insert mode (see The 3 modes). Choose:

Insert → chordname ...

The chord name dialog appears

Insert a root, an up text and a down text and press OK. Then click at the position to place the chordname on:

NtEd allowes you to place special letters like the flat symbol inside the text:

A\b -->

The following table gives an overview about the possible signs:

\O
\S
\#
\b
\n
\o

Modifying an deleting chord names works similar to modifying and deleting arbitrary text.