Umbrella Net help, please.

I just bought this recently -

I got it to use when pier fishing instead of a gafting hook incase I caught something too big so if it's something I can't legally keep, I throw it back unharmed.

I'm trying to get it into the locking position but it won't move. I'm afraid I'm going to break it. Has anyone used it before? It's put together the same way as on the website - it came that way - is it put together wrong? Is that why it won't move? Did I make a bad purchase? I didn't want to buy one of the huge lobster nets, there's no way I could handle one of those.