Depends on which keyboard you have. Swiss / German? Windows keyboard? If yes to both, then like this:
< > is on the far left, to the right of the small "shift" key.
[ ] and { } are on the right, directly to the left of the "enter" key. For these comrades, however, you have to press the "alt(gr)" key at the same time, directly to the right of the long space key. You have to take a close look at the symbols on the keyboard, the [ ] { } are drawn in small circles, also the "gr" of "alt(gr)" is hidden in a circle.
Who knows what Logitech was thinking with this trashy keyboard labelling. Otherwise, the keyboard is great!