Hi @BananaMan Welcome to the Forum
This may help:
https://discourse.shapr3d.com/t/lettering-graphics-in-shapr3d-s3d/5301
It is a bit ‘old hat’ now but it should help you on your way.
If you have a Graphics Package that can handle DXF you could type in the Text or Numbers needed and then import into S3D.
If you need more help just shout
Happy S3Ding 