Under the Actions column of the configured connection you want to update, click Edit.
A screen very similar to the initial screen used to add the connection will be displayed, which will allow you to modify the details of the connection. If you want to configure more options, click Advanced.
Under the Advanced option, you'll find Cache Configuration and Mapping Configuration.
Under Cache Configuration, you can enable cache clearing for Remote Object Links and also adjust the time before the cache is cleared (in minutes).
Under Mapping Configuration, you can specify what options are to be made available on "Associate" endpoint servlet:
Associate Only - Only associate, no data synchronization
Associate and Push to JIRA - After associating, all updates will be pushed to JIRA based on mapped fields
Associate and pull from JIRA - After associating, the update will pull from JIRA to Salesforce.com based on mapped fields. Only one associate is allowed.
Update the fields as required and click Update to save your changes.
Under the Actions column of the configured connection you want to test, click Test. This will run a test to validate the details you have provided are correct.
If the test result is successful, then the connection is ready to be used.