I don't understand the purpose of the colored squares on the Sin dial. I know that they represent the Sin that corresponds with the color, but what does this mean?

Does it mean that I can use the effects of that sin, if it's attached to the resource?

Assign - When building your force, the Rock of Eternity is assigned to a character on your force with a point value of 50 or more. The assigned character is called your Champion. Your Champion can use the standard powers indicated by the SHAZAM! dial when it is assigned the same number of tokens indicated next to the slot. When a special power or attached Sin is showing on either the SHAZAM! or Sin dial, your Champion may use its effects.

I remember scouring that unit for a good 10 minutes trying to figure it out.

Thanks, dude!