You'll have to locate the boot directory, on my Mac it's in /Volumes/boot.
If you're on a Mac, open Terminal (Applications > Utilities > Terminal) and type:
On Windows, you'll need to use Command Prompt instead.
All you have to do is create an empty file called ssh.
If this file exists, ssh will be enabled when the pi is booted.
The Raspberry Pi is a wonderfully flexible SBC and easily one of our favorite open-source boards on the market today.