To use the generated email signature in Gmail, first copy the entire signature from the preview. In Gmail, click the gear icon in the upper right corner and select 'See all settings'. Navigate to the 'General' tab and scroll down to the 'Signature' section. Click on 'Create new' to create a new signature or edit an existing one. Paste the copied signature into the signature editor and save your changes by scrolling down and clicking 'Save Changes'. For macOS Mail, copy the entire signature from the preview. In Mail, go to 'Mail' > 'Preferences' in the menu bar, and click on the 'Signatures' tab. Click the '+' button to create a new signature or select an existing one. In the right-hand pane, paste the copied signature. Make sure to uncheck the 'Always match my default message font' option to retain the signature's original formatting. Finally, in the 'Choose Signature' dropdown menu in the left-hand pane, select the new signature to set it as the default for your email account.
