[solved] Nav Bar in one line

Hello!
My navigation bar displays pages in two different rows, even though there is room for all of them to appear in one line. I would like to place them all in one line and centered, if possible. Could anyone help with that?
This is the website:
http://aedean2016.unizar.es/wordpress/
Also, I was wondering whether it is possible to remove the “/wordpress” bit from the url.
Thank you very much!!