The Contact tab contains all the contact information for a place, and allows you to easily enter and access any valuable account information you want to store as a reminder in the note field.
How to enter the comment/note for an account
1. Click on the Place tab and select the place you wish to see from the place's list.
2. Click on the Contact tab, located at the top of the page.
3. Click on Edit. Start making changes in the field called Note.
4. After you're done, tap on Save.
Please note that there is a design difference between Android and iOS devices so on Android when filled out, the comment section will appear as Note while on iOS devices the section will remain named as Comment.