The profile you created at the beginning is your YoungOnes profile. You should see this profile as a kind of online CV. The client can see at a glance whether you meet the requirements of the job.
You can find your profile at the top right of the app.
After the job, the client can also rate you by giving your YoungOnes profile a rating. Did you work super well and hard? Then the company will give you a good rating. As a result, that you will be chosen faster by other clients in the future!