how to include jar in cuba studio

Support
#1

I need to use few utility jars in my project. I tried to learn from link Can't use my JAR file - CUBA.Platform
but didnt get it. as where to update Gradle:
buildscript {
…
repositories {
maven {
…
}
flatDir { dirs ‘c:\work\lib’ }
}

Can someone explain in detail steps to include custom jars

#2

Please ignore , I found build.gradle under project directory,
Thanks

#3

Also you can use Project properties - Advanced tab from CUBA Studio.