First, read the Program document located here.  

On this website you will find an Application and Agreement form.  Complete the form and submit it to your department chair/head.  Approval of your participation in the Partial Tenure Relinquishment Program is at the discretion of your department chair/head, as well as your dean, director, vice provost, or vice president.  Final approval by the Provost is required before becoming effective.  If your request is approved, you will be notified by your department chair/head.