Hi Kati -
This might help also:
You have to pick which packages you want to install on your instance of .LRN.
Basically it involves 2 steps:
1. Installing the package you would like on your site.
See here:
https://openacs.org/doc/openacs-5-2/configuring-install-packages.html
2. Mounting the package to a URL via the site-map
See here:
https://openacs.org/doc/openacs-5-2/configuring-mounting-packages.html
I think these are mostly accurate. Don't hesitate to ask if you
get stuck.
Avni