'Register' link is missing

I love this plugin, but I am having a hard time providing the ‘register’ link to my website visitors. I can customize the contents of the ‘login’ ‘register’ ‘forgot password’ and ‘reset password’ screens, I see that. But I am confused about how to use this information that appears at the top of the screen where I customize each one:

You can customize the content of the login, registration, forgot password, and reset password pages by using the following boxes.
You can include any of the following tags to customize the content of the page:
%FORM% = Shows the appropriate form. If not included, form appears below the content.
%REGISTER_URL% = URL of the register page NOTE: Users must be allowed to register for this to work!
%REGISTER_LINK% = Link to the register page NOTE: Users must be allowed to register for this to work!
%LOGIN_URL% = URL of the login page
%LOGIN_LINK% = Link to the login page
%FORGOT_PASSWORD_URL% = URL of the forgot password page
%FORGOT_PASSWORD_LINK% = Link to the forgot password page

Maybe I am just stupid, but I don’t see how I can use those tags?? The bottom line is that I want to provide a ‘register here’ link to my website visitors.

http://wordpress.org/extend/plugins/s8-simple-taxonomy-images/