Do I use my Pokémon Trainer Club account to sign in to TOM?

No, you’ll need to create a profile specific to TOM. It’s recommended that you don’t use your Pokémon Trainer Club password, or any password that you use for anything else, as the credentials are stored in plain text on your computer. Additionally, if you ever need to use TOM on a different computer, you will need to create a separate profile there.