Sony PCG-R505GL - Manual (Page 149)

Upgrading Your Computer’s Memory
149
To install a memory module
1 Remove the existing memory module from the computer. See “To remove a
memory module” for more information.
2 Remove the new memory module from its packaging, and install the
memory module by sliding it into the open slot at a 45-degree angle.
Removing a Memory Module
Do not touch any part of the motherboard or the other components inside
the computer.