Update concepts-audit.md

Author: GennadNY

articles/postgresql/flexible-server/concepts-audit.md

@@ -24,7 +24,25 @@ By default, pgAudit log statements are emitted along with your regular log state
 To learn how to set up logging to Azure Storage, Event Hubs, or Azure Monitor logs, visit the resource logs section of the [server logs article](concepts-logging.md).
 
 ## Installing pgAudit
+Before you can install pgAudit extension in Azure Database for PostgreSQL - Flexible Server, you will need to allow-list pgAudit extension for use. 
 
+Using the [Azure portal](https://portal.azure.com):
+
+   1. Select your Azure Database for PostgreSQL - Flexible Server.
+   2. On the sidebar, select **Server Parameters**.
+   3. Search for the `azure.extensions` parameter.
+   4. Select pgAudit as extension you wish to allow-list.
+     :::image type="content" source="./media/concepts-extensions/allow-list.png" alt-text=" Screenshot showing Azure Database for PostgreSQL - allow-listing extensions for installation ":::
+  
+Using [Azure CLI](/cli/azure/):
+
+   You can allow-list extensions via CLI parameter set [command](/cli/azure/postgres/flexible-server/parameter?view=azure-cli-latest&preserve-view=true). 
+
+   ```bash
+az postgres flexible-server parameter set --resource-group <your resource group>  --server-name <your server name> --subscription <your subscription id> --name azure.extensions --value pgAudit
+   ```
+
+ 
 To install pgAudit, you need to include it in the server's shared preload libraries. A change to Postgres's `shared_preload_libraries` parameter requires a server restart to take effect. You can change parameters using the [Azure portal](howto-configure-server-parameters-using-portal.md), [Azure CLI](howto-configure-server-parameters-using-cli.md), or [REST API](/rest/api/postgresql/singleserver/configurations/createorupdate).
 
 Using the [Azure portal](https://portal.azure.com):