First, locate the Upload These Files directory inside the downloaded package. This directory will contain a single install.php file. Use a file transfer program to upload the install.php file to your server.
The install.php file should be uploaded into the directory where you want to install the script. This means that it should typically be the only file in that directory. For example, if you want to install the script in a subdirectory named 'seo', you will upload the script to 'seo/install.php'.
Navigate to the install.php file in your web browser and follow the on-screen instructions to install.
If the installer gives you an error message, read it carefully. If you aren't sure what an error means or how to fix it, please contact me. I'll be happy to help.
The installer displays a spinning indicator when it is performing back-end work. If the installer has been stuck on one of these indicators for more than a few minutes, a script error probably occurred. Please contact me. I'll be happy to help.
Please create a new, empty MySQL database to avoid any conflicts. Then, create a MySQL user, and write down the username and password you choose. Finally, assign the user to the database. If you need help with any of this, please contact your web host, as they are best suited to help you through this process.
After all that is done, enter the database name, username, and password into the installer. The hostname is usually "localhost" unless you are specifically told otherwise. The default port is 3306. If you need to specify a different port, enter the hostname in the format "localhost:4406".
If you receive "access denied" errors from the installer, then some of the credentials you provided are incorrect. If the error message says "using password: yes", then the password is incorrect. If it says "no", then the username or database name is incorrect.
If the installer extracted files without any errors, then you do not need to configure file permissions — they have been configured automatically.
Access the admin panel and head over to Settings » Extensions to view the built-in extensions, which are disabled by default. Click the "Enable" button on an extension to add it to your script.
After enabling an extension, you might see a warning at the top of the admin panel. Click the link in the warning and configure the extension as necessary. Note that the warning may not immediately disappear, even if you configure it properly.
Please refer to the previous question, "What should I do after installation?" for instructions on how to fix this.