That's it. I am now a contributor, my account have been approved.
I still have this below my name though :
As they said I can now upload my photos. To upload your photos, you just have to tap the big blue "Upload" button in the top right corner of the page :
When you uploaded some pictures, they arrive in your portfolio, and here, you need to add : A Title, a catégory, tags and a price and then you cansend them to be verified before to be published.
You can see that I have uploaded 7 photos yet, and 0 views on it, I hope some photos would have som views and maybe some purchases. There is some of the photos :
