Hi Ang,
Let me assist you on this one!
To open the full door you need to hold the lever-less area of the handle and to open the upper door press the lever area on the handle and then pull.
For more info check page 19 on the user manual.
https://bit.ly/2LXCKQv
If after doing this the bottom part of the door remain locked please contact us via:
Facebook Messenger: http://m.me/samsungsupport
Twitter: https://twitter.com/messages/compose?recipient_id=18768513
LiveChat or Email: https://www.samsung.com/us/support/#contact_us_for_support
Toll-free calling: 1-800-SAMSUNG
^Joan