Head over to your reply account.

Settings > Integrations > API - or click on this link

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Then head over to the custom fields section in Reply and add add the following custom fields

EMAIL1, EMAIL2, SELECTED_EMAIL, BACKUP_EMAIL1, BACKUP_EMAIL2 (this can you can choose whichever you'd like)

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After you've added it, it'll show up like this

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Once done, copy your API key and then paste it in the integrations section of Smartwriter

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Select Reply and then paste in the API key you've copied from Reply, Name the API key so you can easily identify it (name it whatever you want)