There is no mod_yj_pop_login in my www/templates/hdchannel/html/.
Only mod_login, but that hasn't got the lines in its default.php as you show!
I looked in modules/mod_yj_pop_login/tmpl/default.php/
There I can't find the lines and after removing it Registration part is gone!
I have narrowed it now to 200px in layout.css, but I cannot find how to get it to the right now it's narrowed.
With Firebug I see this line:
<div id="login_pop" style="display: block; left: 541.5px; opacity: 0; visibility: hidden;">
So I thought to change 541.5px but cannot find where it is even not with Firebug?