Hi,
Check this article
How to install Symantec Endpoint Protection Small Business Edition clients
http://www.symantec.com/docs/TECH93328
There are two Small Business Editions & those are
SEP 12.0 Small Business Edition
SEP 12.1 Small Business Edition
Which product you are using ?
On right hand top corner, you will see common task, under drop down there is an option to install Protection clients on computers.
Screen-shot is attached for your reference.
I hope it will help you !!!