Select the (e.g., Board Geometry) and Subclass (e.g., Silkscreen_Top).
You can manually place text on any layer (Silkscreen, Assembly, etc.) using the top menu: Go to . In the Options pane on the right: OrCAD / Allegro PCB Editor
Click on the board where you want the text to start and type your message. Select the (e
Choose a (this determines the size and font style). Select the (e.g.
In the table that appears, you can define parameters for each block number: Physical size of characters.