Contact Sitoo Support for assistance with locating your PIN. Most times we are able to assist you with finding it. If, however, you have completely forgotten your PIN and don't have access to your iPad, follow these steps on Apples support pages in order to reset your iPad: Reset your iPad
We strongly recommend that you are certain that your PIN cannot be retrieved before resetting your iPad. See it as a last resort. The process of resetting an iPad is quite time consuming.