You will have to go through an agent with a Zoopla subscription to advertise.
If you click on 'Find Agents' at the top of the page you can find all agents in your area who are on Zoopla.
Hope that helps.
Zoopla only allow for estate agents to advertise here. therefore if you do want to list your property on Zoopla you would need to instruct an estate agent who advertises here to sell your property. You can search for local agents who advertise on Zoopla using the "find agents" tab at the top of this page.