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I’m sorry to hear you're having trouble. I know that can be frustrating. Hopefully, we can get this resolved quickly.
Yes you should do it before turning it on first.
The procedure is to first remove the back cover, which you can follow here
Then to remove the memory module and put the new one in, follow the procedure here.
And to put the new one in, follow the procedure here
If you have any issues, please let me know