Well, you can see that in the pattern: you need 5 strings of one colour (A), and the other five strings (you need 10 strings in total) should be in five different colours (B,C,D,E,F). :[ Can't you read patterns? Maybe there's a tutorial on reading patterns. But I hope you understand now.
Here is a tip that I used to work easily After you start keep knotting every Color in this way 2 forward knots - 1 backward knot with the main color - then 3 forward knots - 1 backward knot - then 2 forward then do the next row all with the main color which is already set in the beginning 🙂