Thanks to you and the links you gave me, I now have a pagination.
But it’s a little more complicated :
I’m on my Blog page (which is display by index.php)
qwerty.com/blog/
2 articles are printed (post_per_page 2 for the example)
The pagination is ok with 2 pages (3 articles total).
My problem is when I try to go on the page 2, I’ve got a 404 error.
qwerty.com/blog/page/2/
I already saw this problem in other posts when the custom post type is called blog and the page is called blog. This is not my case.
I use “Blog” as page.
I use the original WordPress Posts as articles (where I added two fields thanks to Magic Fields 2).
Do you have any idea of what it could be ?