Update WCC UI connection details using WLST commands.

OS Version : Windows 10
WCC Version : 12.2.1.3.0

1. Open command prompt and go to <MW_Home>\Oracle_Home\oracle_common\common\bin
   eg: C:\cd C:\xxxxxxx\Middleware\Oracle_Home\oracle_common\common\bin

2. Set the WL_HOME environment variable
   eg: set WL_HOME=<MW_Home>\Oracle_Home\wlserver
  
3. Execute 'wlst' command.

4. Connect WCC UI server instance using connect command.
   eg: connect('weblogic','<Password>','t3://localhost:16225')
  
5. Execute listRIDCConnections to view RIDC connection information.
   Eg: listRIDCConnections('Oracle WebCenter Content - Web UI')
  
6. Execute updateRIDCConnection to update RIDC connection details.
   Eg: updateRIDCConnection('Oracle WebCenter Content - Web UI','WccAdfServerConnection',connUrl='idc://localhost:4444',credUsername='weblogic')

7. Execute exit command to exit from WLST mode
   Eg: exit()


Try here to update WCC UI connection details from EM console.