How to reinitialise wordpress from ovh

hi every one.
i'm new in ovh and in wordpress too. I modified my admin wp address adding "/fbwp" at the end of link in " sitting> general" in word press. after saving modification, the loading page showned is without css and the top bar where i used to se links like "wordpress icon" ,"personalise" ,is not displayed . the login wp page is shown too without any design and after login action , i have a "not found page".
I don't know how to access again at the normal wp interface
Any idea?