Please use the same steps as you have before with posting your first job, just make sure to review the information our agent shared in order for your job to be in line with our ToS.
I'll share the steps again with you in case you're unsure how to follow through. You can post a job as explained here, verify your payment method, review the proposals you receive, hire a freelancer to complete this work for you and process the payment as explained in these two articles: here and here.
You can also opt for getting assistance from our dedicated team, helping new client post their jobs and invite best talent for their specific project. Please review the client resources we posted here. Let us know if you have any questions or need further assistance.