All is incorrect. Please remove wpForo, remove all copied themes, remove anything you've done. Then open WordPress active theme folder and if you have /wpforo/ folder in /wp-content/themes/yourtheme/ folder please delete it. It seems you use an old wpForo template files in WordPress theme directory.

Once wpForo is deactivated (not uninstalled), deleted, search and install it again.

another question : it seems an icone is missing : cf copy screen.

Thank you Robert for your rapid answer.

Sorry ... I did't thnink you would answer so quiclky .... I deleted/upadted a few of my post.