We are looking into correcting that bad hyperlink on the pop-up box. As for adding new scripts, you can only add a new script one at a time. So you will need to add a script, refresh. Then add the next script, refresh, etc. (I'm guessing that you want to add KK's scripts, rather than the supported versions we have already running on Eyewire).
If you're still having trouble, please let us know and include your OS, browser info (and if possible a console screenshot so we can see if there are any errors).