Well i've been reading for a long time and I now know the use of spirit and power stones, however I have no idea about how to use energy stones. Sorry for being ignorant in this. Can anyone answer my question please.
What are energy stones for?
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Whutzittooyah You use it to vote for the next novel to be translated under the “what’s next” section. It has the 
sign. You get 5SS for your first daily vote.
Whutzittooyah you can use as support to translator/author from the novel you read, especially those author from original novel, they will glad to receive your power stone 
Hi ! Please, you can give to me detailed instruction? Because I don't understand still how I can use energy stone. Thanks!
Tylmarin when you open the novel page, on below side there's vote options. You can click that
SweetsTomato I think @Tylmarin was talking about energy stones not power stones. :)
Tylmarin Hi, in the home page in the site, if you scroll down, you'll see the yellow bar of "what's next". You can just click vote below the novels you wish will be translated next.
Here are the links in case you still can't find these:
Home Page - https://www.webnovel.com/
What's Next - https://www.webnovel.com/vote
If you're using the app, then in the explore tab, it's the yellow circle with the lightning symbol. :)
DazzlingGem Thanks for correcting me 
SweetsTomato ;) No problem.
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SweetsTomato Thanks!
DazzlingGem Thanks!