hey all,,

well i have a phpBB forum and i need to install hacks,,, but in some hacks the very first step is

Code:
# 
#-----[ SQL ]------------------------------------------ 
#
# Remember to change the table prefix used on your database
ALTER TABLE `phpbb_forums` ADD `forum_icon_new_post` VARCHAR( 255 ) default NULL;
ALTER TABLE `phpbb_forums` ADD `forum_icon_no_post` VARCHAR( 255 ) default NULL;

#
# Remember to do this for each installed language pack!
#

and i don't know what that is

help plzzz