I found it strange, that members only get to create groups from within their Profile Navigation so I wanted to add a “Create Group” Button on the Group Directory Page but somehow, the bp_options_nav() does not work there.
Anyone got a clue on how to do this since there is also no option like bp_create_group_button()?
Try <a class="button" href="<?php echo bp_root_domain() . '/' . BP_GROUPS_SLUG . '/create/' ?>"><?php _e( 'Create a Group', 'buddypress' ) ?></a>. Make sure you wrap it in if ( is_user_logged_in() ) as bp_root_domain() will be empty for non-logged-in users