pixel016

And when i list all the taxonomies i have this in the log file :

[22-Jan-2014 16:25:04 UTC] <p>category</p>
[22-Jan-2014 16:25:04 UTC] <p>post_tag</p>
[22-Jan-2014 16:25:04 UTC] <p>nav_menu</p>
[22-Jan-2014 16:25:04 UTC] <p>link_category</p>
[22-Jan-2014 16:25:04 UTC] <p>post_format</p>

Why i don’t have my custom taxonomy “artist-category” here ?

I try to use wp_set_object_terms( $post_id, 'dj', 'artist-category',false); but not working

But first of all i just want to know how to add a featured picture (from picture url for example)

No idea ? :s

Good question because i use “user meta” plugin for the register form and the url of user profil picture is stored in wp_usermeta table (wordpress database). So i don’t know how to get it.
??

Yes user create a new profil and when they do that i want to create a new post (artist) with featured picture (the profil picture of the user).

Yes but this function enable the thumbnails but i want to add on the post a featured picture automaticaly when a user register.