I am newbie to the `salesforce` and working on the `Live Agent` setup and its other useful features. Now I am looking to implement the `Pre-Chat form`, but I dont see the option to choose form. I see the below, Could you please guide what setting needs to be done ?

[![enter image description here](https://i.stack.imgur.com/hnUor.png)](https://i.stack.imgur.com/hnUor.png)

I have created a custom VF page and now I want to choose that form. But I dont see that option. I created the Pre-chart form using : <https://developer.salesforce.com/docs/atlas.en-us.live_agent_dev.meta/live_agent_dev/live_agent_pre_chat_forms_code_sample.htm>