How do I prevent the TARDIS from travelling to dimensions, I tried editing the config as so:

        # Put the dimensions here you don't want people to travel to

        S:"Dimension Blacklist" <

            tardis

            vortis

            varos

            trenzalore

            skaro

            mondas

            mars

            gallifrey

         >

However it still lets me travel to those dimensions, did I type in the dimensions wrong? I also tried adding a "thedalekmod:" prefix to each of the names, and deop-ing myself, but it still doesn't work

I'm using r63 on 1.12.2 on a single player world.

You need to use the dimension IDs, if you look further down in the config you should see them all listed.

Hope this helps!