You can use this

https://ejss-browser-editor.herokuapp.com/ to set/change the lock answer without EJSS editor.

Step1: go to https://ejss-browser-editor.herokuapp.com/
Step2: download the model from this Joomla webpage say https://iwant2study.org/ospsg/index.php/917
Step3: Follow the instructions on https://ejss-browser-editor.herokuapp.com/ such as Upload Model, the website will check if the model.zip file is editable, if editable, key in your own values and save
Step4: Click Download Model and upload to any server such as SLS and it will accept your new variables set, therefore, it is your own Simulator with your set initial values.