delete posts

I had to make a new admin login and password to get into my site , there has been a lot of spam profiles and posts, I can not delete the posts , am I missing something >banning the member and or ip does not delete posts. I do not have or my original login and password would not work . Everything...

Not sure whether this is a bug or something specific to my computer/video card, but here goes. When I select a post that contains an embedded video from YouTube, the image of the embedded video covers xenforo's pop-up deletion box. See image.