How To Login from bootstrap modal?

[leefish]

This implies that on the localhost you are not loading the bootstrap.js - check your headerinclude, see if you have the js correctly linked. You can do an inspect element and look to see if all resources are loading.

If the reason you want the bootstrap modal to work in the templates is because it is conflicting with the mybb modal then create a bootstrap.js build of your own that doesnt include the modal.  http://getbootstrap.com/customize/