Adding on another computer to a wireless router

[riptide]

I had a computer man come and set up my wireless router to my laptop. I now want to add another computer to the router, any ideas how I would do this. Is it quite straight forward. My router is a BT model and I want to add a desktop to it with a wireless capability. Is it a question of finding the leads to connect to the wireless router and plugging them into the back of the computer and it will connect. My wireless is a secure system. As you can tell, I am not a computer expert by an means, but any advice would be appreciated.
Thanks Riptide

[Ethel]

You may simply be able to connect just by turning the new pc on, and entering the 'key' when prompted.

[Ethel]

If your desktop pc is going to be close to the router, you would be far better off connecting to the router with ethernet cable than be wireless.

[riptide]

Thanks Ethel, my computer is actually upstairs with the router downstairs. To show my ignorance, what is the"key"?

Thanks for your help.

Riptide

[Ethel]

The key is the password for the router security. :)

If your router is not secured, it should be.