In your event's left navigation menu, locate Setup and then select Form Builder. Click on the (+) icon to add a custom question (or any form block) to the form. This will place the block to the bottom of your form.

Additionally, you can also drag the box into the form anywhere below the registration block:
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Editing (or deleting) a form block, whether it is a custom question or a meal preference block has the same pattern. Follow the next steps to make changes to your form block:

Step 1: In your event's left navigation menu, locate Setup and then select Form Builder.

Step 2: Scroll down your screen and locate the form block you want to edit/delete.
At the top right corner of the form block, you will see a settings button. Click on it to see available options.

Step 3: Click 'Remove'

To permanently delete the form block and all data associated with it, click 'Remove' and confirm your intent to do so. This can not be undone.

Step 3: Click 'Settings'
The settings Menu will appear on the left side of your screen. Make the desired changes to your block: you can change the title of the block along with the audience settings.

Step 4: Save

Save the changes you made and run through your registration process to make sure everything looks and works the way you want it to. If your event is already published, you will need to republish it.