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I can feel the pain. But let me tell you what you did wrong. You used wrong main tag and your post was very short! According to your topic #movies would have been better main tag! And you know that there's a community named gems, you should have posted there, instead of just tagging with #gems!
And try to write more than 1000 words on every article. I wrote a lots of Hive related articles, Check those to get more ideas.

Hope you'll get your desired success!

How to post in a community?

Go to this link for the list of all communites - https://hive.blog/communities
Subscribe to the community you want to join and then post. :)

I have already subscribed, so it was posted there automatically?

Go to the community you subscribed and click on post.

Thank you very much. Can I post the same content in this way? Or the next time?

No, dont post the article you already posted. Make another one and post it to your selected community.

You've taught me something with this comment. Since I was not Steeming when Commuties got started, I thought that your first tag automatically posted your content to the Community of the same name if it existed. So since coming to HIVE, I thought my posts were showing up in a community feed, when actually I was just posting to the recesses of the HIVE blockchain without any specific eyes on it.

Maybe an old dog CAN learn new tricks!

I found this confusing too.