Drawing text to images

Question

I am developing software to run Church presentations to be displayed by the projector.
I need to apply text to an image in the manor that it is done in powerpoint.
I can draw text to an image, but my problem is how to draw text that is editable so that I may change,delete,redraw.
I may Have to code something totally from scratch. Any Suggestions???? Does anyone know how Powerpoint does it.
Thank you all in advance..