If I understand your concern here, you have installed Jira, but you do not see the gear icon in the top right corner of the page. This option is only seen in Jira Server when you are signed into Jira as an administrator. If you do not see this when logged into Jira, then your account is not configured to be an administrator.
If you know there is another user in your site that is a System Administrator, that user can grant other accounts admin privileges via the permissions setup in the Managing Global permissions.
If you do not have any other users that you know have system admin rights to Jira, then you could follow the steps in Retrieving the JIRA Administrator. This document gives you steps on how to reset the admin password via SQL.
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