How can members create posts without access to WordPress Panel

create a post from BuddyPress dashboard inside my website and not in the wp-admin section!

dashboard = wp-admin. Or did you mean you wanted member’s to post from the front end of the site instead of going to wp-admin? If so, there are WP and BP plugins/scripts that allow for front-end posting like http://wordpress.org/extend/plugins/quick-post-widget/ or http://wordpress.org/extend/plugins/search.php?q=front+end+posting or http://buddydev.com/plugins/bp-simple-front-end-post/ for BuddyPress

A new one http://buddydev.com/buddypress/introducing-buddyblog-allow-users-to-blog-from-their-buddypress-profile/