The vtiger CRM has been installed into ${INSTDIR}

You should point this to the DocumentRoot of your web-server:
   # ln -s ../vtigercrm /var/www/htdocs/vtigercrm
(make sure you use a relative symlink since Apache is chrooted)

Make sure you read the online installation manual before going into
production:
   http://wiki.vtiger.com/index.php/Vtiger_CRM_-_Installation_Manual

*** First install
To complete the installation, you must create an empty MySQL database
and grant a corresponding user all privileges to it.
Then point your web browser to:
http://<hostname>/vtigercrm/install.php

*** Upgrade
To complete the upgrade, login as an admin user, go to the "Settings"
tab then use the "Migration Wizard".