By default, hitting enter will always skip a line and start a new paragraph.  If you want to go to the next line without starting a new paragraph, hold down the shift key when you press enter. 


For example:


This is the first line of the first paragraph in my news article. [Shift][Enter]

This is the second line of the first paragraph. [Enter]


This is the first line of the second paragraph. [Shift][Enter]

End of article.