Maybe a different person explaining in different words might help? So here...
open putty.
type in the IP address you found into "Host name (or IP address)" box - should look similar to this: 192.168.1.123
leave "Port" as default 22
Make sure "SSH" ispicked instead of Raw,Telnet,Rlogin, or serial
Click "Open" at bottom of Putty window...
Black terminal window will open, and in about 1-2 seconds your PI is be found and respond with "Login as:"
Now you type in your username. If accepted, it will come back and ask for password: NOTE - whenyou type the password IT WILL NOT SHOW, so just have faith, type it, and press enter. If it takes, you will see Pi menu.