Dell Inspiron 1428 (Late 2009) - Manual (Page 30)

30 Memory Module(s)
4 Lift and slide the memory-module cover off the computer base.
CAUTION: To prevent damage to the memory module connector, do not use tools
to spread the memory module securing clips.
5 Use your fingertips to carefully spread apart the securing clips on each end
of the memory-module connector until the memory module pops up.
1 screw 2 memory-module cover
3 memory-module cover tabs (2)
1
2
3