Lenovo ThinkCentre A63 6674 Hardware Maintenance Manual page 96

3. Locate the memory slots. See "Locating parts on the system board" on page 88.
4. Open the retaining clips.
Figure 7. Opening the retaining clips
Figure 8. Removing the memory module
5. Position the memory module over the memory slot. Make sure that the notch
Figure 9. Installing the memory module
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Hardware Maintenance Manual
If you are replacing an old memory module, open the retaining clips and
remove the memory module being replaced as shown.
1 on the memory module aligns correctly with the slot key 2 on the system
board. Push the memory module straight down into the slot until the retaining
clips close.