Hi Iqenas,
The .js files used by Yate/YateBTS are located in /usr/share/yate/scripts
The .conf files are in /etc/yate/sdr
Before doing any modifications please backup the content of the whole directory: both scripts and configurations.
YateBTS is an extension over Yate:
https://wiki.yatebts.com/index.php/About_YateBTS#YateBTSIn Labkit Yate runs as a service and is installed from packages. You can configure it from /etc/yate/sdr and add additional scripts in /usr/share/yate/scripts. It is quite rare for people to need to modify anything in the Yate code. If you want to experiment with the C++ code of Yate you would need to download sources from svn, stop yate-sdr service and then run the downloaded version.