Documentation for JIRA 5.2. Documentation for other versions of JIRA is available too. 
To remove the Remember my login on this computer option on the login page, follow the instructions below:
Option 1 (recommended)
The check box for this option can be disabled by setting the jira.option.allowcookies property to false in your jira-config.properties file.
You will need to restart JIRA in order for this change to take effect.
Option 2
Edit the ./atlassian-jira/includes/loginform.jsp file.
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