Right now the only way to change the color of a single word or collection of words, but NOT the entire text block, is through the CSS which is not intuitive for functional users.
The only workaround is to bring 2 separate text elements together, side by side, in 1 paragraph. If you do this, then one of the text boxes (the text you need in a different color) can reflect the color of choice in the Styles tab.
Would love for this to be a feature request we work on!