Here you can find step by step configuration for use IHS htadmin
Step 1 generate user :
/opt/ibm/HTTPServer/bin/htpasswd -cm /opt/ibm/HTTPServer/conf/admin.passwd htadmin
Step 2 edit admin.conf :
vi /opt/ibm/HTTPServer/conf/conf/admin.conf
#Change listen port:
Listen 8008
#Change running user
User wwwrun
Group www
#Set serverName
ServerName servername.mydomain.com
Step 3 add user and group to run htadmin:
groupadd www
useradd wwwrun -g www
Step 4 run htadmin:
/opt/ibm/HTTPServer/bin/adminctl start