Which FTP software did you install ?
If you don't remember, open a console window and type:
rpm -qa | grep ftpd
To uncompress a TARed GZip (.tar.gz) in the current directory, type:
tar -zxvf <filename>
To uncompress to a different location, type:
tar -zxvf <filename> -C /other/location
May I suggest installing your software in /usr/local
This is usually where non-RPM software is placed.