Dell OptiPlex 7490 All-In-One - Installing the memory modules

Steps
1. Pry and remove the DIMM door from the system-board shield.
2. Using your fingertips, spread apart the securing clips on the memory-module slot until the memory module pops up.
3. Slide and remove the memory module from the memory-module slot.
NOTE: Repeat step 2 and 3 if there are two memory modules.
Installing the memory modules
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following image indicates the location of the memory module and provides a visual representation of the installation
procedure.
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Removing and installing components