Insert a button at the menu bar

Hello friends,

I use this plugin since one week and it works good and looks perfectly, because I blocked my default menu. But there is a problem: I used to have a button at my menu bar for Log in and out. But this button wont be shown at my certain menu. I used to put it in the header of my theme. With a little bit css it fitted perfectly at my old menu bar. I tried this the same way with the blurry menu, but it doesnt work. So I am going to insert this button code at some folder of the Blurry plugin. The problem is, I dont`t now which folder is the right. Should I add the code at the css folder? Please help me at this point. Here is my button code:

Log In/Out

Thanks mates. The Url to my website is included at this code. Ah and sorry for my bad english guys!