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Please provide the model of the enclosure?
The release button is on one of the short sides of the device.
I'm sorry I couldn't help, I will respectfully ***** ***** other professionals can provide any more information on this.
Welcome to Justanswer.com, my name is Dustin.I'm sorry to hear about the issue you are having, I will do my best to help you resolve it.
Is this the enclosure you have ?
Some of these enclosures dont have a release switch, instead you have to slide the top away from the bottom, long ways, till you hear a click. Please watch this video at about 1:30 seconds for a demonstration.
Whether or not this works for you please send a reply so that I can assist you further if needed, or so we can mark this issue as resolved.