Tag module Gallery2 - im on this foto - tag my username

Im am using the Tags module succesfully.

What I need is a button/link under the photo whith the function "Add my username as tag"

I can get the username from cookie[1] or the Database.
But I am having trouble becouse I dont know what I need to do with the Auth_token.

If you see yourself on the foto you can click on a button to add your <username> tag.

module:
http://codex.gallery2.org/Gallery2:Modules:tags

PHP-Nuke versie: 7.6
Gallery URL = http://www.*.*/modules/gallery2/main.php
Gallery version = 2.3 core 1.3.0
API = Core 7.54, Module 3.9, Theme 2.6, Embed 1.5
PHP version = 5.2.9 cgi-fcgi
Webserver = Apache/2.0.54 (Fedora)
Database = mysqli 5.0.27, lock.system=flock
Toolkits = Getid3, Exif, Gd, NetPBM
Acceleration = none, none
Operating system = Linux ********
Default theme = matrix
gettext = enabled
Locale = nl_NL
Browser = Mozilla/5.0 (Windows; U; Windows NT 5.1; nl; rv:1.9.1.9) Gecko/20100315 Firefox/3.5.9