The wiki says that I should be able to select a planet with available labor, right click on a different planet I control and terraform it to change it's resource. When I do that, the option doesn't appear.

Does anyone know if I'm missing something?

terraform is a game option you have to turn on in the settings before you start a game

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edit; backup image for people that can not see maxcdn servers

Thanks. That did it.

Apparently it doesn't let you edit opening posts to mark them as questions retroactively.