How to redirect to modal?
Edit

According to the Readme.txt, 


  You should now see login and register links on the right of the main bootstrap nav bar.


Enabling the module should show a link on the nav bar by default. 

According to the project page,


  You should now see login and register links on the right of the main bootstrap nav bar. 


/Edit

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You can update all the links on your content, or use Javascript on a page load to modify them.

If you want to go with JS. This should get you started:

  var aTags = document.getElementsByTagName("a");
  for (var i = 0; i &lt; aTags.length; i++) {
    if(atags[i].href == "/user/login") {
      //Modify your links
    }
  }