So, you'd like to posit a question to your participants where they can select one or all of the options presented? Here is how it works:
1. Click on Insert Stimuli.
2. Choose Options.
Voila! You now have a radio button response mechanism, but you'll have to make a change to turn it into checkboxes. The options you have to play with are as follows:
Multiple selection: Check this box! This is how you switch the response mechanism from radio buttons into check boxes.
On change: If you check this, once the participant selects ONE radio button, they will automatically be taken to the next trial. That means they will not be able to select multiple answers, so use this cautiously.
Required: If you check this, an answer to this question must be selected by the participant if they are to continue on in the survey. If they do not select an answer, they will not be able to click the "Next" button (or whatever stimulus you create to advance to the next trial).
Variable name: You must enter a name for this variable that is different than all of the other response mechanisms in your survey to ensure that the data entered by participants is stored in your spreadsheet. For example, if your question was "Which are your favourite seasons?" you might name this variable "season_selection".
Response time: Check this if you'd like to know how long it takes until the participant makes their last selection.
Options: Each item you enter here becomes an option the participant can select. For example, if you wish to ask "Which are your favourite seasons?", you would want to have four items available to select from. You would replace "selection_1" with "Winter", and then press the icon to create a second selection item. In this item you would type "Spring", and you would repeat these steps to add "Summer" and "Fall". If you wish to delete an item, you can either type over it with a replacement item (for example, if you wished to replace "Fall" with "Autumn", you can just delete "Fall" and type in "Autumn") or click the icon.
Layout: Your options here are:
Timed display: Check "enable" if you want the checkbox response mechanism to either appear or disappear after a certain amount of time. For example, if you want someone to view an image for 30 seconds before selecting a response, or if you want to force them to answer in 30 seconds so the options disappear after that time.
To have your response mechanism appear after a certain time, enter the amount of time in milliseconds next to "Show After". To have your response mechanism disappear after a certain amount of time, enter the amount of time in milliseconds next to "Hide After".
Position & Size: These boxes allow you to alter where on the page the response mechanism appears and how tall or wide it is.