What do you mean?

When using an FTP client such as Filezilla, folders and files uploaded to the server are automatically set to a high security protocol. How can we set the file permissions to be 755 for folders and 644 for files? Below is an example of the File Permissions window.

Image: http://dreamsickle.com/files/File%20Permissions.png

That would depend what FTP server you have installed. Additionally I would look for settings in Filezilla.

are you using sFTP? using plain FTP has some serious security issues.

I think umask is what you need to work with:

https://www.digitalocean.com/community/tutorials/linux-permissions-basics-and-how-to-use-umask-on-a-vps