@brunoedigital, can you explain exactly what you are looking for? There is a change tags feature in the admin wrench. To access, click the small icon to the top right of the topic list, then select via check boxes the topics you wish to change the tags on. Next, click the admin wrench in the top right, and click Change Tags. Enter the tags you want, and click Change Tags. Important note: doing so changes the tags, it does not append them. Any tags currently on the selected topics will be removed, so this does not work to add a tag to topics that already have tags. The option to mass append tags has been request, however.