Apple MacBook Pro (13-inch, Early 2011) - Manual (Page 45)

45 Chapter 3 Boost Your MacBook Pro
3 Push the levers on the sides of the memory module outward to release the module
from the memory card slot.
The memory pops up at an angle. Before removing it, make sure you see the half-circle
notches. If you don’t, try pressing the levers outward again.
Notches