But where, exactly, do you want any colouration to take place?

I would like admin names to appear red in the member list as well as their name to be red in topic posts and replies.

Same with sponsors but in another color such as blue 

You’re going to have to bear with me here as I don’t currently have access to my local test environment so although I know it’s possible, right now the CSS is guess work!

Firstly, could you go to your dashboard and navigate to Forum > Themes > Custom CSS..  Please add the following CSS:

And let us know how it goes? We may need to adjust a couple of the classes used there.

Also in order to give ‘Sponsors’ a colour we would need to see the members list group and also a post from a sponsor to know what class to target.

I tried to use your suggestion for the default moderator group. This is what I used below with no luck.

#spMainContainer .spTopicPostSection .spType-Moderators .spProfilePopupLink {
color: #FF0000;
}
#spMainContainer .spMemberGroupsSection .spUsergroup-moderators .spProfilePopupLink {
color: #FF0000;
}

Afraid I will have to hand this one over to Andy or Steve. As I said currently have no test environment so can’t try it out locally, but it is definitely possible.

Thanks Ike. This is the forum like FYI http://yotamafia.com/forum/

Just check in forum admin > options that you are not using the CSS compressed cache. If you are – turn it off until you are happy with any changes.
Also – depending on what browser you are using you will probably need to clear the web cache between tests. Chrome and IE/Edge both cache things far longer than many other browsers.
So try those things first and then come back and let us know the outcome.
i will be off-line for a short spell but will be back in a little while to pick this up

Would that be in one of these sections?

Because I do not see any settings with the wording you mentioned.

Yes indeed. Global settings over on the right. Apologies for not being more specific.

Neither one is checked.

I should have asked an additional question – which is how are these users identified? I can certainly differentiate on admins and users and guests but I can also differentiate other user group membership or on special ranks… ?

I just need:

Admins colored RED

Sponsors colored BLUE

Yes – but what ARE ‘Sponsors’? Is this the name of a forum user group? A forum rank?

Usergroup.