How to voidable lease

[Zoe Smith]

Hello

My tenant did not pay the balance of move-in costs by the due date after the contract execution.  Several unsuccessful attempts have been made to request payments and have received multiple excuses (could not find the checkbook or could not send electronic payment).  The tenants have not moved in.

At this point I just want to void this contract and move on.  How do I go about voiding the contract?  When can I offer the rental to the next applicant? 

Thank you.