Adding Salesforce to JIRA Application Links

Create a new link for Salesforce, using the URL of your Salesforce instance (example: https://cs20.salesforce.com) 

Continue with manual configuration when the following pop up is displayed

Enter the values shown, as in the example below 

Once the link is created, Edit the link to update Incoming Authentication and upload the certificate created in Salesforce

Paste the cert downloaded from Salesforce in the Public Key text box (as shown below)

Save the configuration and close the window