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First, click "Registration" at the top of this page. To open in a new tab in most browsers, on a Windows or Linux based machine hold ctrl while clicking, or on a MacOS machine hold the apple key while clicking on the link.
Next, on the "Registration" page, fill out your desired username, a valid email address that you are able to check, and a password. You must also read the terms of service (found by clicking on the link text "Terms of Service") and click the check box that indicates that you accept those terms. The last thing to fill out on this form is a "Protection code". This is a string of four letters which you must type correctly into the text box beside them, to confirm that you are, in fact, a human.
If any of the information you have entered is detected to either be incorrect/invalid, or if you have used an email address or username that another person has already registered, you will be shown that page again with some notes about what pieces of information you need to change. After changing/correcting your information, the form should submit without error. If you continue to have errors, simply change/check the information again and try submitting once more.
Within a few minutes of having submitted the form, you should receive an email from the server with an activation link in it. The final step of registering your account is completed by clicking that link.
Once you have registered you may login to your account on the website by clicking the "Login" link at the top of the page.
After you have logged in, click the "Profile" link at the top of the page.
This page is where you can set up some important details of how your interaction with the mining server will work. On this page you can change your username, email address, set a nickname (which will be used to identify your contributions in public server stats), the minimum number of bitcoins you want to earn in the pool before it pays them out to you, and (most importantly) what bitcoin address those bitcoins should be paid to.
Also, lower on the page, are options to be a part of several services btcmine offers (at no extra charge), including: having your miners displayed in the top miners list (assuming they produce enough shares to be included), email notification whenever a payment is made to your bitcoin address by the pool, and whether you would like to receive news and offers from btcmine. There is also a "Balance access auth token" which can be used in scripts to automatically check your balance and do whatever you want with that information.
If you have filled in a bitcoin address, you are now ready to start mining.
IMPORTANT NOTE: Using separate miner logins and passwords for each miner instance you are running is absolutely necessary for proper long-polling support
By default there is one mining account set up with the login: your_username@your_username and password: your_username (where "your_username" should be replaced by the username you signed up and logged in with) and you can use that information along with the "How do you use a piece of mining software with the server?" question on the "Help" page to run a miner. If you have multiple machines, or any other reason to be running multiple instances of mining software, you may either use the same login and password for all of them, or, from the "profile" page click on the "Miners" link, and add as many miners as necessary currently the limit is: 25 per user account. From this link, you may also change any miner passwords.