how do i get to in world?

i made an account but i still cant get to in world someone help me please!!

There would have been instructions when you signed up...

Ah, you download Second Life from:

http://secondlife.com/download

Then, you double-click the file on your computer to install it.

A shortcut will appear on your desktop (I'm assuming you're on a PC) and double-click that. Enter your Resident name and password and connect.

Make sure you meet the System Requirements too.