1)View the config settings in addons/eventscripts/skin_chooser/es_skin_chooser.txt and tweak

2)You can edit the skins in addons/eventscripts/skin_chooser/es_skin_chooser_settings_db.txt

3)You can add all the materials and models to addons/eventscripts/skin_chooser/es_skin_chooser_downloads_db.txt

4)Load an Auth Interface Provider inside autoexec.cfg.

For example:

es_load examples/auth/basic_authes_set BASIC_AUTH_ADMIN_LIST "STEAM_ID_LAN;

STEAM_0:0:571273;STEAM_0:0:7103742;"

5)Add this to your autoexec.cfg (after Auth):

es_load skin_chooser

6) Restart your server