Why I created encrypted disk but I cant either open it or put files in it?

I followed the support. apple.com's on "How to creat a password-protected (encrypted) disk.
I thought I sucessfuly made it. But I cant move any files to the disk neither to open it.
And there is no window pops out that required me to put password
I dont know what to do.
please help me.
Thank you very much!

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