A user's account has been locked, How do I unlock it?

Your phpBB Version: 2.0.
phpBB Type: Standard phpBB
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Your knowledge: Beginner
Board URL: [url]http://[/url]
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What was done before the problem appeared?
What was done to try to solve the problem?
De.scription and Message
As title says. Also, there is a way to increae the number of improper logins/ how to ?
phpBB Type: Standard phpBB
MODs: No
Your knowledge: Beginner
Board URL: [url]http://[/url]
PHP Version:
MySQL Version:
What was done before the problem appeared?
What was done to try to solve the problem?
De.scription and Message
As title says. Also, there is a way to increae the number of improper logins/ how to ?