You can click on the text in the 3D panel and in the properties panel click on Character Panel to change things like text size, spacing etc.
If you want to change the letters, then click on Edit Source, change the type and Edit>Save.
You meant File>Save not Edit>Save - correct?
Yes i meant File>Save.
I thought i had corrected that along with including a screenshot.
Did you see a screenshot in the reply?
No screen shot but I'm squared.