edit: Alternatively you can use this handy website:
http://en.nicoviewer.info/ to watch videos without logging in.
This is for people who want to watch nicovideos for Melty Blood and for any other videos.
Here is a picture easy tutorial!
Click here, to Login if you already have an account. If you don't click here anyways so we can get to the registration page
To register
Premium account is on the left if you want to pay money for JP nico porn
Typing a valid email address is important cause you need it later to confirm your account
You can put anything in for Area, also keep in mind password has to be from 8-16 characters.
Now go to your email and confirm your account with the link inside
Now you're done ;|