If you're just looking to change the color of text, you could do something like
<p style="color:#FF0000;">Colored text goes here</p>
where you change the parameter of color (the 6 characters after the hashtag) to be the desired color in RGB. The characters can be anything from 0-9 or A-F.
It's a bit complicated to explain but basically the first 2 characters control the amount of red, the next 2 control the amount of green, and the last 2 control the amount of blue. Play around with that and see what you get
Specific colors have presets which make life easier. For example, I could use