Changing the color of a word in the text is easy with the formating tabs given by blogger when writing a new post.
To change the color of one or more words in the title a little html is necessary:
Put the word you want to change in between < color = "xxxxxxx">
and < /font color >
For the xxxxx you have to choose the code from a chart (here is an example). And leave out all spaces. I can't type without the spaces, because due to web technic you won't see the tag.
The blogger software is translating the html in something else I don't know so far.