How do I edit the Login string for Studio Theme

I am using the Studio Theme and I need to edit the Login string for the Log in link located at the Top of this theme.
Right now the string is:
http://mywebsite.com/wp-login.php?redirect_to=http%3A%2F%2Fmywebsite.com

the redirect is negating a user level Welcome page I have set up and taking users to the home page.
How do I edit this string to just be?:
http://mywebsite.com/wp-login.php

Thanks