XF 2.3 Change Font Colour when writing a post?

[SEOmers]

Hi - I can't find the answer anyway, but I've had a couple of comments from members who are complaining that they can't see the text when writing a new post etc

'front end' is wonderful. I've looked everywhere but can't find where I can change that. I'm in Admin>Style Properties>basic colors?

 

[Mr Lucky]

Ignore previous (deleted) response), for writing a post try this group (about 2/3 way down the list of groups)