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Desktop Browser

Setting pref mode to 'email'
Click 'Share' icon
Enter opportunity detail (The email note is automatically to this opportunity related to the followed contact. How to move email note to another opportunity?)
Mobile APP

The email mode could be set from app sidebar ->  settings
The latest emails will appear in the email tab of mobile app.
If a contact is followed, the related emails will appear in the followed tab.
Import of legacy SGN notes could be done by clicking the plus button of notes tab. Learn More
Click the color label to change note background color
If team member is enabled, you could write notes for your team members.