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HCataLog is already installed and comes with Hive.
HCatalog is available under hive/hcatalog/, you can navigate to hcatalog/bin to run hcatalog command.
To configure it, make sure that Hive uses and external metastore .
In the conf/hive-site.xml include the following properties to use MySQL as the metastore database instead of the default Derby database. Modify the properties appropriately to reflect the environment.
Start the Hive shell and it will automatically connect to the MySQL database and create the required tables in it.
Hope it resolves your query.
If you have any further query,please let us know.