Dell Inspiron 1521 (Mid 2007) - Manual (Page 151)

Adding and Replacing Parts
151
3 Remove the keyboard (see "Keyboard" on page 148).
NOTE:
It is not necessary to disconnect the keyboard cable from the memory
module cover.
4 Lift the memory module cover but do not remove it.
NOTICE:
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 module pops up.
6 Remove the module from the connector.
1 memory module cover 2 memory module (DIMM A)
3 securing clips (2)
1
2
3