I was trying to get the filmic colour management tool for blender however I installed blender with snap so that I could get 2.8 But now I can't change the folders and add the new folder within the snap directory. Is there any way in which I can change this?
If you have Blender 2.8 you already have filmic as it now comes as standard - https://docs.blender.org/manual/en/latest/render/color_management.html#render.
For anyone running Blender < 2.8 for any reason, you can use the OCIO environment variable as per the docs - https://sobotka.github.io/filmic-blender
Extract the Filmic Blender files somewhere and create the environment variable:
You should add this to your .profile to make this permanent.