Page History

To upload a spreadsheet of contacts, it needs to be saved as a .csv file. This means a "comma separated values" file as opposed to an Excel file. You can mark this when you go to "Save As" and use the drop-down box to change the type of file.
Next, go to Contacts (

in the Apps grid next to your Google profile icon). Expand the 3 hamburger menu on the left and click the word "More" to expand that section of the menu. Choose "Import" and navigate to your file.
For a step-by-step import tutorial straight from Google: https://support.google.com/contacts/answer/1069522

Google's instructions can be found at: https://support.google.com/mail/answer/30970?hl=e
Note that Google uses the term "Labels" to reference a group name.

To access delegated account please follow steps below:

1. Click on the image or initial icon at the top right corner of your screen
2. In the drop-down menu that appears, once the mailbox has been delegated you will see the mailbox listed with (delegated) after the email address. Click on the delegated account (note: If you have a lot of shared mailboxes, you may need to use the scrollbar on the right to view them all).
3. The shared/delegated account will open in a new tab or window. It will look just like another inbox but will NOT include: 

• Chat
• Calendar, Docs/Drive, Sites (calendars are delegated separately and will be accessed through My Calendars or Other Calendars in your Google Calendar view)
• Add-ons
• Access to some account settings
• Themes

Note: Once you have been added as delegate it may take up to 24 hours for delegated account to appear below your primary account.