How can I edit my Dark Form?

What you actually need to do is:

ctrl +shift + c

type: testingcheats on
(in the cheat window it will say "cheats are enabled")

then type: cas.fulleditmode
(nothing will come up in the cheat window in response to you typing this)

DO NOT close the cheat window yet (It won't work if you close it now)

with cheat window still open, shift + left click on sim, select edit in cas or modify in cas (I forget which it is) - it's on the right of the options.

Then when you're in cas you can close the cheat window.
Make your changes, click the tick.

When you're back in-wold, open the cheat window again, type: testingcheats off
(in the cheat window it will say "cheats are disabled")
close cheat window.

edited for more info.

I can confirm '' change sim '' does the trick. I had this same issue, not being able to change the dark form.

In hindsight, change sim only worked for a short while then it changed back - only fulleditmode changed it for good.

You used to be able to edit your newly turned vampire using "Change Sim". At some point this was removed whether by accident or design I don't know. I have edited my turned sims dark form by using either cas.fulleditmode or "manage worlds then edit family".

However recently I was able to edit the dark form without any of that and I don't know why that happened. I also don't know if that is a permanent change or is going to be random.

Hey! So as you thankfully got answered (Thanks Bronwin!) I'm going to close this off as it's been inactive since 2017. If you have any questions about necroposting you can read this thread here : Necroposting