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The easiest path is to choose the client for your device. For a feature phone, use Jimm as a JAR file; for Windows, QIP 2005 is usually more comfortable. First download the client from the download page, then register a new account with a Latin-letter nickname, first name, email, numeric UIN, and password. After that, open the connection settings in the client. In QIP, go to server/proxy settings, set the server to icq.jimm.fun, port 5190, and proxy NONE. In Jimm, choose a regular TCP connection, the same server, and the same port. The login is usually the UIN, while the password is the one used during registration. If connection fails, check the common mistakes: wrong server, proxy enabled, or nickname entered instead of UIN. On old phones, also check GPRS/EDGE or Wi-Fi settings, Java network permissions, and the device date. After a successful login, you can add contacts by UIN or nickname, change your status, and use the client like classic ICQ.
Download the client first, create a new UIN, then enter the credentials in QIP or Jimm. This saves time because you already know which login and password belong in the client.
The usual blockers are enabled proxy, wrong port, nickname entered instead of UIN, or old credentials from the closed official ICQ network. On phones, also check internet profile and Java permissions.