If you want to create/insert you own question into to form, you can do so by Adding New Custom Question.

You can find the option at the left panel under Design >> Forms

To create New Custom Question:

i. Click on the Create New Custom Question under Custom Question at the right panel



ii. Type question name

iii. Select from dropdown type of question 


iv. Once you're done, click Save

v. To add the Custom Question into your Form