how do you write onto a pdf?

i want to type onto a FORMLESS pdf. I have professional, but there's such a shitload of stupid features I can't figure it out and don't know what it's called.

when I say formless, I mean it doesn't have pre-made entry forms for typing, you would have to create your own

And scan the camera. And print on the memory card. And buy it, use it break it fix it trash it change it melt upgrade it chart it point it zoom it press it snap it work it quick erase it...