How to change default Apache home dir in Webmin ?

ServerName ${DOM}
ServerAlias www.${DOM}
DocumentRoot ${HOME}/public_html
ErrorLog ${HOME}/logs/error_log
CustomLog ${HOME}/logs/access_log combined
ScriptAlias /cgi-bin/ ${HOME}/cgi-bin/
DirectoryIndex index.html index.htm index.php index.php4 index.php5
<Directory ${HOME}/public_html>
Options -Indexes IncludesNOEXEC FollowSymLinks
allow from all
AllowOverride All
</Directory>
<Directory ${HOME}/cgi-bin>
allow from all
</Directory>