When adding text to be engraved, use Edges > Engraving Text. This allows Router Edges to be applied.
Depending on the type of engraving you wish to achieve, you may need to download a suitable font e.g. a single line text. Once downloaded this can be stored in, C:\Windows\Fonts. Once in this location it can be selected as a font within PYTHA, you may need to restart PYTHA before it becomes available.