add multiple questions to your campaign, click on 'Manage Question'.
Select a campaign you've created earlier from the drop down list.
your 'Question' and select preferable 'Answer Type' either in Radio
Button, Check Box or Drop Down List. (If you select 'Drop Down List',
only plain text is allowed for this question type.)
insert multiple answers in Rich Text format using the HTML editor where
you can personalise font color, insert pictures, links, etc. For
additional answer entries, enter the total of new answer item(s) that
you want. Then, hit the 'Go' button and the new answer items with HTML
editor will appear.
checkbox of 'Show Other Answer Text Box' to create a textbox that
required users to fill out their answers. You can put a default text in
the textbox as "If other, please specify". (Label will only appear when
answer type is in radio button or checkbox)