Cannot select Taxonomy in content form

Hello, i need help i'm getting crazy with taxonomy management...

I create a taxonomy vocabulary, i linked it to a content type, i add 20 terms.

In my content type - > manage field i can see "Taxonomie--Taxonomy module form" field

In manage form - > i have also "taxonomie" and it's activate

But now when i go to edit or create new content in this given content type, their is now option to select taxonomy, what i missed ?

Thanks for helping me