So it can be quite challenging to assign new subtitles to the correct episodes, if those episodes are nonexistent on IMDb. There's an easy fix for that, and that it is to add the episodes on IMDb. But their process is extremely tedious, they require you to add them one by one! A multi-upload is impossible.
But there's a fix for that as well. Download/install the following script: http://userscripts-mirror.org/scripts/show/74813. It will add a button which will allow you to add a whole range of episodes in a single go, which in turn will help you to assign the subtitles to the correct episode on Opensubtitles.org.
