How to Create a New Button on the Change Request form?

How to Create a New Button on the Change Request form?

We are trying to implement the Risk Score on the Change Request form by following the below Article Link : 

Link : https://pitstop.manageengine.com/portal/en/community/topic/risk-and-impact-score-is-not-popping-out-after-adding-the-html-script-and-adding-the-java-script-in-formload-rule-in-uat-in-additional-field-risk-score

But how can we add (create) a new button on the Change Request form?