To

Do this

Insert text

Right-click over block to enter text-entry mode. Right-click again to exit text-entry mode.

Copy-Paste text

You can copy text from other applications into a comment block by pressing CTRL+C to copy the text and CTRL+V to paste it.

To retain formatting, activate Use Rich Text Format under Edit > Preferences > Preferences. This allows Greek letters and math symbols to be mixed with regular fonts. When Use Rich Text Format is not activated, text reverts to the format specified in the View > Fonts command.

Resize block

Drag on its edges.