Before creating an opportunity switch into the Admin mode for your organisation using the switch panel.
Then click the "+" button to open the create options. Select the Create an opportunity option.
Fill in the details for each section, clicking 'Next step' to move to the next section.
When setting the location make sure you select an address from the list
Don't forget to say how many volunteers you are looking to recruit
Net click preview to check your opportunity before publishing
If you are happy click Publish. This will pop up your options for where to publish
Volunteering opportunities are by default set to publish to both the organisation or ecosystem's marketplace that you re currently in AND the Do it public home channel. If you don't want to publish into the public national Do it Marketplace you can deselect it.
Click Publish and you're done.
If you need to go back and edit your opportunity at any point, you can find it in the opportunities list in your Dashboard.