Do the following as OTRS administrator:

1. In the OTRS dashboard, select the Admin tab.
2. In the Admin tab, select SysConfig in the "System Administrattion" section.
   
   The "Dynamic Fields Management - Overview" dialog appears, displaying the "Dynamic Fields List".
   
3. Select the JIRAIssueID ticket.
   The "Dynamic Fields - Ticket: Change Text Field" dialog appears.
   
4. If needed, enter the correct URL then click Submit.