When requesting a cooperation with a property you simply click My agency cooperations on the left menu.
After clicking that link you can click the Create new cooperation in the top right corner.
If you have multiple travel agencies you will need to choose from which one you want to request. If you only have one, you will be directed to the list of all properties that you are not cooperating with.
You will see a list of properties and you can choose maximum 10 properties to send out a cooperation request to in one go.
Click Next and then you can send an optional message and click Request.
Once the property has assigned you a price agreement and a cancellation policy, you will be notified with an email which states that the cooperation has been approved or rejected.
Once the cooperation is approved, you can check availability and book at their property.