Step 1

Unzip and upload all files and folders into your website using an ftp client like filezilla

Step 2

If you are installing it in a directory instead of root (ie yoursite.com/cms)
then open up the .htaccess file FIND:
RewriteBase /

and replace with:
RewriteBase /cms

Step 3

Create a mysql database , username and password
give create , drop tables permision to the user

Step 4

navigate to yoursite.com/install and follow the screen