if you want to create a texture, like in the tutorial, you have to twist your object:
you select all upper vertices (in left view, for example);
activate “Proportional edit mode” - linear falloff;
rotate 45° along Z and adjust the area of falloff so that the first loop, the lower, does not rotate.
or another method:
add a cube with same height like your rope;
select the rope and add a “Mesh deform” modifiers;
in “object” field select the cube and click Bind, and wait;
select cube, select the upper 4 vertices, and rote along Z 45°;
same result, in second mode more control.
I hope this help you
and sorry for my english.
ciao!