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

>>7
But I need to write upon a PDF. Can OpenOffice insert text onto PDFs and then export the PDF?

Also: do you guys really get a kick out of responding to every thread with bullshit? It might be funny if anything you said was original, but it's all the same in variations. I enjoy trolling just as much as anyone else, but there needs to be reason and context for it otherwise it's just retarded.