As Jon has said, installing RAM is quite easy. There are guides online that outline each step. In fact, I believe the Dell site has specific instructions for you exact laptop (it did for my old inspiron laptop).
Now here is your problem. RAM is limited. It could be limited by the bus (the system used to transfer data around in the computer) or by physical hardware limitations.
If you have a 32 bit computer, you can at most use 4 GB of RAM. This is because with 32 bits, you can only address that much memory. Any more can not be accessed and will never provide any benefit should you stay on 32 bit.
The other most likely situation is that you have a 64 bit computer with a limit imposed on the hardware. It might be 8 GB or 16 GB or if its an expensive laptop (which yours isn't) you could even see some going up to 32 GB of RAM. Your is most likely limited to 8 GB.
You motherboard just physically can't use more. Look in your computers manual to see just how much RAM your computer can use and in how many sticks of RAM. I suspect you may be limited to 8 GB of RAM using two 4 GB sticks.
If you want a computer with 1 TB of RAM, you will need a supercomputer with thousands of processors and those cost millions.
For 1TB of RAM, it would probably cost you anywhere between $12,000 to $16,000! RAM is actually quite expensive, and most of the time, most systems don't have much more than 16GB of RAM installed (64 times less). So I don't think you really meant 1TB of RAM, but rather a 1TB of storage, such as a hard disk.
1TB of hard disk space would cost maybe $70 or less. Or alternatively you really meant to say how much for an additional 1GB of RAM, possibly? If you have 3GB installed, then likely it's installed as one 2GB module and one 1GB.
You'd have to get rid of the 1GB module and install a second 2GB module in its place. Pick Parts, Build Your PC, Compare and Share - PCPartPicker http://pcpartpicker.com.
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