Your personal Security tab in your Profile is where you control your own account's security. Four things live there.
1. Change password
Profile > Security > Change Password. Enter current password + new + confirm. Takes effect immediately; other sessions stay open. See reset-password for the full flow.
2. Two-factor authentication
Profile > Security > Two-factor authentication. Enable, change method, regenerate recovery codes. See enable-two-factor-auth for the full setup walkthrough.
3. Active sessions
Profile > Security > Active Sessions shows every device currently logged in as you - browser, OS, last activity, location (approximate). Click "Sign out" on any session to terminate it remotely - useful if you forgot to log out on a public computer or suspect someone else is using your account.
4. Security log
Profile > Security > Security Log shows the last 30 days of security-relevant events on your account: logins, password changes, 2FA enable/disable, role grants you received, SSO group changes. Useful for spotting anything you didn't do.