Change this color

How the fuck do i change the title color of one single posts and not all of them. I hope they explain this in my course. Been trying to find a solution for 2,5h now. I give up!!!!

The only useful think i learned after this research was how to navigate in the code. And how to change the color of the blog title "Diary" and have it different colors on the main page and the other pages. Just do like this.
Instead of.

Click to expand

.Header h1 {
  font: $(header.font);
  color: $(header.text.color);
  text-shadow: 0 0 $(title.shadow.spread) #000000;
}
.Header h1 a {
  color: $(header.text.color);
}

Write this

.Header h1 {
  font: $(header.font);
  color: $(header.text.color);
  text-shadow: 0 0 $(title.shadow.spread) #000000;
}
.Header h1 a {
text-shadow: 0 0 $(title.shadow.spread) #000000;
}