Acer B1-720 Service Manual page 73

Pry to release the left side latches, following the direction of the arrow.
3.
Pry to release the bottom side latches, following the direction of the arrow.
4.
Service and Maintenance
Figure 5-7. Unlocking the Latches (3 of 4)
Figure 5-8. Unlocking the Latches (4 of 4)
5-7