Before you hire someone, you have to make a payment of either $400 (writing) or $1,200 (designer). That would be one month of 80 working hours.
Once you start working with a hired freelancer, you should release their payment every 30 days. You can buy more hours for a new month of work on a new project.
When you are done working with a freelancer, change the project’s status to complete and please leave a review for the freelancer.