@giraffe34 they're just regular forward knots with two strings. so for example, the two red strands. take red 1 and do a forward knot on red 2, so red 1 will have moved from left to right. then take red 2 and do a forward knot on red 1, now red 2 is the string that has moved from left to right. do this 3 more times and u have the red knots done!
for the other colours, 4 times will do. (accd to the pattern!) hope this helps!