delete names from peoples tab

Hi All

Please bear with me Iam not very good with the technical side of computers, thanks!

Changed from Hotmail to Outlook.

In the 'Peoples tab' I have contacts I want to delete but it says 'cannot delete from other lists'  skype etc I guess?

Please how do I delete these names please!?

I have tried checking the the box alongside the names, hold the shift key down, press page down, press delete....as I found on a search, but it doesn't work.

Thank you