The documentation says as below :
Create an application link
- In Jira, navigate to Jira settings (cog icon) > Applications > Application links.
- In the Enter the URL of the application you want to link field, enter any URL, for example,
<a href="http://example.com/" target="_blank" rel="nofollow noopener noreferrer">http://example.com/</a>, and then click Create new link. Ignore the No response was received from the URL you entered warning that is displayed and click Continue. On the first screen of the Link applications dialog, select the Create incoming link checkbox (1).
But I am trying to find this option with user who has admin access,but I can damn nowhere find out this option