I appreciate your help, time & patience. I didn't find Classic FTP for Mac 1.00 (that's the version of Classic FTP I downloaded, last night) in my system preferences section when I was looking for it, in there. I didn't find it by using the Terminal in my computer, neither. I did empty my Mac's Trash folder, but that application made folders & files which were hidden somewhere in my computer's database. Last night, I remembered the suggestions you gave to me, and I got AppCleaner®, which deleted that Classic FTP program after I did the following things:
I selected "Applications" option on AppCleaner's menu bar, and waited for AppClean to find the folder, in which the Classic FTP was hidden. haha Even thought AppClean detected that FTP-application, it didn't show in which folder that FTP-program was hidden.
Anyway, it worked well enough. I was a fool for downloading that FTP-application. It's been getting horrible reviews on popular CNET-websites like:
http://www.versiontracker.com/dyn/moreinfo/macosx/32770