Edit links of LOGIN | REGISTER and edit CSS box Login

I found problems with the display of the login box.
I tried to insert the CSS code that I found at this link:
84-hewahoo/41812-module-positions-overview-please.html
but the result you can see the screen attached.

Schermata 10-2455840 alle 12.08.48_2011-10-05.png

I also tried to change the values ​​eventually find worse.
I also need to change the Register link which will lead to the module of joomla to be able to accept some terms and conditions, but I could not figure out how to do, I try to put any change in the index file always takes me at the box registration default.