not sure what you mean… do you mean a soft return vs paragraph?  its wysiwg, so a return yields a new paragraph… the spacing of that new paragraph will be determined by your css…  but if you want a soft return, instead of hitting return, hit shift-enter…

It is exactly that normal space I want, when hitting the shift+enter. Is it not possible to make it standard, so I won’t have to hit it every time? If so, a detailed guide would be much appreciated

Hmm, just found out that if I add the line “.mceContentBody p {padding:0; margin:0;}” in folder: wp-content > sp-resources > forum-plugins > tinymce-richtext > resources > themes > advanced > skins > o2k7 > content.css

Then it will change to single spacing in the editor. But it will still show with double spacing when posted..

As Steve pointed out above there is NO double spacing anywhere. These are paragraphs and as such are styled by the CSS being used. As you have found you can adjust the padding that is given to paragraphs in the editor. The padding used for post display can be adjusted in your SP theme CSS. Which SP theme are you using?

I am using the default theme (shades of grey). Can you pinpoint the line that I need to adjust in the theme CSS?

You need:

#spMainContainer .spTopicPostSection .spPostSection .spPostContentSection .spPostContent p

As always we recommend that you create your own SP theme so that any customisation is not lost during a future update. (http://codex.simple-press.com/codex/themes/theme-basics/creating-a-theme/)