Pick a task, carefully complete the task based on the instructions.
Upload task when done.
If there are any errors after submission, you will be alerted and you make corrections based on the error message.
If you submit and get no error, after a few minutes a rendering window comes up for you to review your work. Once satisfied with it, send to QA and wait for feedback.
You'll most likely go through a few corrections with the client till the job is eventually marked as finished