How do you put on the collars in a tricep bar?

Yea just bought it, really confused on how to put collars on to secure weight on tricep bar.

I’m guessing it’s not a spin-lock, coz that’s dead easy to figure out. Most collars require you to squeeze 2 prongs, and slide it over the bar, or twist something, slide it, then lock it again.
Perhaps research the model or make online, and see what others are saying..?? If you give me some more details about it, maybe a link to a pic, and I might be able to help you a little more..??

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