Center page titles & space underneath menu

Hi guys,

I only want to center my page titles and not my newstitles. I managed to center every title, but I only want the page titles to be centered. Not the title of a newspost. (See: http://www.wilmawestenberg.nl – which is good – and http://www.wilmawestenberg.nl/category/nieuws – which is not good. The title of the newspost is ‘Summerschool Roemenie’, but it’s centered.)

I also want less space between the menu and the page title. I managed to do this, but on pages where I don’t have a title (because it’s a category) the text is too close at the menu. (See the first sentence: http://wilmawestenberg.nl/category/nieuws ) The page starts with text, which is too close at the menu.

I’m using Twenty Eleven and I don’t use a Childtheme, because I don’t understand it and I’m kinda noob. :’) So please, don’t say ‘you should use a childtheme’ because I already tried.

Sorry for the bad English, hope you can understand it. :p