Changing font colors for whole document 5.0

When editing a document, I like to change the font color to red. However, when I change the color and make an edit , it then defaults back to the original font color and I have to change the color for every edit. Is there a way to keep the color once I set it the first time? Am I doing something wrong? or is this a bug? Any help would be greatly appreciated. Thank you very much.

I think editing the Default paragraph style must solve your questions.