Please read this guide to inform yourself about the possibilities you have as team-mod in your own team-forum and usergroup.
http://www.phpbb.com/support/documentation/3.0/moderatorguide/index.php
http://www.phpbb.com/support/documentation/3.0/adminguide/acp_groups.php
The moderator-role is actually set to permission: FULL MODERATOR except delete option
@Mods -> Please, never touch (edit) any global announcement topics!!!!
edit: "How to manage your usergroup" infographic added