How to modify conf file?

Hi,

Just new about the UCS. Really appreciate this soft but iam not a pro with linux distrib. I installed owncloud and settings up all good.

However, i would like to modify some settings like upload limits, default portal language or owncloud access port and this way, i googled for 2 days without findin answer (or i dont understand it ?).

Anyway my question is “simple” : how can i access to this file/repository to modify ? I tried through putty but well… i can just type command like cd to see the good repository and what then ?

Thx you !