In my account, I couldn't find any mining button option. Is it implemented if so then an admin should have announced it right?
It's still in testing and hasn't been rolled out to all users yet. It wasn't there for me last night when it was reported on here but it is this morning. It looks like they're slowly adding more users in.
From the site
Please note that this feature is currently experimental and is only available to a limited number of users. Once it is rolled out across the website, we shall be able to increase the mining rewards further.