You don't need the freezer yet, and you may damage it that way. The freezer method works only rarely, and you should avoid the person who suggested this.
I'll bet there are screws under those black strips on the top and bottom, which will likely slide right off. Inside there will probably be two connectors, one for power, one for data.
You can either try another case, or get the adapter I suggested. which is a very handy item if you tinker with PCs.