Make sure that the memory card is a 2G DDR3-1333 module.
I purchased for $25 from a local CompUSA retail store (affiliated with TigerDirect) a "Centon MemoryPower 2GB DDR3-1333 SO DIMM, 204-pin" Memory Upgrade Module [Centon #:R1333SO2048].
You can go to centon dot com forward slash cmp (this is my first post so I can't place the actual URL in the message - which is why I am spelling it out).
Or go to a local CompUSA store.
After purchasing the memory card, I then went to YouTube (on another computer) and followed the video instructions from Jrin.net on:
How to upgrade & dismantle Dell Mini 10v 1018
How to reassemble the Dell Mini 10v 1018
NOTE: Go to YouTube and copy and paste the above titles in the search box and look for username jrinco11.
The Jrin.net teardown video shows you how to completely dis-assemble your Dell Mini 1018 - which is instructional on upgrading ram, upgrading the hard drive, and replacing the keyboard, monitor, and any other user serviceable parts. For the purpose of upgrading RAM, you only need to follow the video up to the part where he takes out the 1G memory module.
Once you take out the 1G memory module exactly like in the video, replace it with the DDR3-1333 2G memory module. Then upload the Jrin.net reassembly video and go to 3:43 to reassemble your Dell Mini from the point of the memory swap.
If you have the correct memory module and you follow the video instructions EXACTLY, your computer will function correctly. Go to "Control Panel > System and Security > System", and you will see 2.00 GB of installed memory (RAM).
If you are willing to keep the memory module you purchased from DELL, try following the above video instructions. The module should work. If it doesn't, return it for a full refund and order the Centon.