Go to the Validation TAB of the password field and set the minimum length to 6 characters and set the value to be required.
到password的Validation选项卡中设定最小长度为6个字符，并且设定值为必须。
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Validation controls enable you to check for a required field, to test against a specific value or pattern of characters, to verify that a value lies within a range, and so on.