You can find step-by-step instructions in this TrainingPeaks Help article on how to connect your eo SwimBETTER and TrainingPeaks accounts.
Once your accounts are linked, any swim you upload to your eo SwimBETTER account will automatically appear in your TrainingPeaks account.
The same article also explains how to:
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Manually upload swims (useful for adding earlier sessions).
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Manually delete a swim from your TrainingPeaks account.