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Your upload storage space is zero so I think you're referring to the submissions counts. Unfortunately, you cannot clear submissions counter. It will only reset by itself to zero every first day of the following month. E.g. Next reset would be on October 01, 2014.
Sorry, but you have to consider upgrading to any of the paid plans for a higher limits.
If you have further questions, please let us know here. We'd be happy to assist.
Thank you and have a good one!