On the DETAILS tab you can: edit the name of your Organization; add or edit the Contact Information; and, change the Timezone and Currency settings.
To edit the information in a section, click the Edit icon (blue pencil).
To save changes in a section, click the Save icon (blue check mark).
To exit editing mode without saving changes, click on the Undo icon (curved arrow).
The email addresses defined on the Organization page should be a single address, not a comma separated list of addresses.