How to index data from a Form?

I have a requirement to collect data from user and insert into Splunk index for further use. This is like the web page where many questions are asked with answer in the dropdown list. User have to select one of those answers from the list. Once the user complete the form and click on SUBMIT button data goes to Splunk index. I am thinking to create an application with dashboard of my requirement but don't know how to insert data in Index. Do you people have any idea about how to do this. Your help is highly appreciated. Thanks.