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Open the iShare Settings and click on the Master Settings tab. Now scroll down to the WebService section and make sure that you have the MetadataWebServiceURL and WebStudioURL configured.
Please see the iShare Settings topic for further details.
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Next you will need to enter the details of the Catalogue Service for the Web (CSW). This is found on the External Services tab of the iShare Settings (prior to V5.8.0 on Master Settings tab) e.g.
Please see the iShare Settings topic for further details.