Customize the 'From:' address pt.2

If you can wait for official enabling of senders field name customization you can use this link. It will let you add alternative email addresses and after their verification you can choose which one to use in compose window. Unfortunately without updating you account you cannot change those settings. All you have to do is to wait when this setting will be officially enabled or change the language settings to English US where you'll get it in Settings>Accounts tab.