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 You can when it's a fresh new list.
You can't when your're editing an existing list and trying to add a new element to it. 
 This should be fixed now. Please let me know if you're still having trouble though.  
 Works now, thanks. @Yana newest version 0.12.0 now also has support for edition of mute lists and search/blocked relay lists, give it a try. Next step will add custom named sets support.