How to delete something from the Notification Center?

Hi Guys and Ladies,

Just a simple question I am hoping someone will be able to help me with. I am unable to either delete or hide some things from my Notification Center.

These two things as per images below started sending me notifications when I started my Mac, which got me curious as to what they were, however upon clicking on them they sent me to websites I have never visited before, so first of all I disabled the notifications because I didn't want to see them ever again, but I can't seem to be able to delete these 2 from the center.

Any suggestions? images below show case I what I mean, I am at wits end because I read up on a wiki that when you unselect the show in notification center they wouldn't be seen. however they are still there, and I want them gone!

Thanks ahead.