I manage fine with mine which may or may not be the same, persevere a little more, they're annoying, but quite easy once you've done it a couple of times. Just double check that your "arm attachments" are on the correct sides of the stands. IIRC they're not the same on each side.
Once the lower of the two "arms" is in place on each side it shouldn't move, the upper "arm" is really just there to hold it in place. Friction should stop it moving as you begin to lift, you push the stand underneath the bike as you do so (against the fork bottom).
Is it basically like this one?
