how to create a new paragraph

how to create a new paragraph

hi,
when i hit 'enter', a get a new line, that's fine. But how do i get a new paragraph, so that sb.else could work on the paragraph before?
e.g.
i write
"testtext"
and then hit enter and write
"secont testtext"
what should I do so that my college can edit "testtext"
i hope you are understanding me
thanks
flooo