For me, no experience with nav forms since anything I've read about them discourages experimentation on my part. Maybe one day...
Anyway, is the text instruction in a label? Just make it a textbox, and if you want, make it look like a label, Enabled = yes, Locked = yes and .SetFocus in the form open event. Might look strange to you with having a blinking cursor in a paragraph of text though.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.