were can i find the words Inside these tag keys example {$system_name}
Jamroom Developers
The docs for developers are here:
Docs: Developer -> Table of Contents:
https://www.jamroom.net/the-jamroom-network/documentation/development
The full docs are here:
Docs: Table of contents
https://www.jamroom.net/the-jamroom-network/documentation/contents
You need to describe what you are doing in order to receive help if we cant understand the steps you are taking we can offer no useful advice.