Try it on the public partner YQL endpoint
(http://partner.yql.yahoo.com:4080/v1/public/yql?format=json&q=`<YOUR_YQL>`)

You may use desc <TABLE_NAME> to query for parameters and samples.
For example:
http://partner.yql.yahoo.com:4080/v1/public/yql?format=json&q=desc%20ecstore.app.get_product
(Please note that the space in the query is URL encoded)

Please refer to the pages on the sidebar