Install php extensions

Hello everyone!
I need help:
How can I install an external php library in scriptcase?
Scriptcase creates its php installation which however I cannot install and enable the extension.
Thank you!

I think you are looking where to put external library?

It is under “Tools” menu:

Thank you for your answer!
I tried looking at it, but I don’t understand how I can install a php extension.
I need to install the imap extension for php but what should I upload?