wrong name dashboard

next to the w of wordpress the name shown of my domain is wrong and also at the top of the page of my website can i change it!
i think wp is the hardest thing i ve haver used 0 intuition i hate it!
here the image for let u understand what i mean
https://www.dropbox.com/s/0w4c4hvxvlcq3qm/Schermata%202013-11-16%20alle%2023.13.18.png