Having trouble getting connection

I am new to SmartFTP and am using a router, but I can't connect. Ive put in all the correct info. This is the message I get- A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.

The server you're trying to connect is down or you did enter the wrong information. Read the tutorials at
https://www.smartftp.com/support/howto