1. Navigate to JIRA > Administration > Applications.
2.  In the Integrations menu group, locate and select Application Links.
3. Enter address of TeamCity server.
4. Click Create new link.
   
5. In the prompted form, click Continue. Please ignore the displayed warning.
6. In the Link application form, specify name of the application link and select 'TeamCity' as the application type.
   
7. Click Continue.
8. Once the application link has been created, click Edit.
9. In the opened form, switch to the Outgoing Authentication tab.
10. Enter the username and password that will be used by JIRA for fetching build data from TeamCity server.
    
11. Click Enable.
12. Close the form.