Yes your post contains the risk-reward indicator:How do I get the risk-reward indicator, and how much does it cost?
https://usethinkscript.com/threads/thinkorswim-risk-reward-indicator.7210/#post-73021
Yes all general forum indicators are free for use
If your question is how to add a script to your chart:
https://usethinkscript.com/threads/how-to-import-existing-thinkscript-code-on-thinkorswim.10/