[Pharo-users] And it goes on - How do I fix a missing repository

I am obviously out of the loop when it comes to all of this repository stuff. So, I have imported my 8.0 code into 9.0 but I can’t add an extension method to ScaledDecimal because a repository is missing. I check what to do and get sent to Iceberg. Somehow, as a newbie, I am supposed to understand how iceberg works but, being a 76 year old VAST Smalltalker, I don’t. Surely, when I install 9.0, qashouldn’t I get everything I need for a basic image? What do I do next. Attached is a screenshot of Iceberg. David