If your getting an error or a blank screen at the time of installation just put the FULL url in both and ignore the error. I think it was bugged when I tried it. There is a full and base url bug that was affecting me in the beginning.

https://www.ubbcentral.com/version7/ubbthreads.php/ubb/showflat/Number/1471/an/0/page/6#Post1471

very last part of this post.

I had to manually adjust things in the beginning.

Happy Customer !!!