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The new retro network needs a new account. Click Register, enter a nickname with Latin letters, first name, email, a unique numeric UIN, and a password with 6-8 Latin letters or digits. These limits matter because old clients and OSCAR-like services are sensitive to login and password format. After registration, use the UIN as the login in Jimm or QIP. The nickname is used for the profile and search, the email is for the website account, and the password is for signing in from the client. If you want friends to add you easily, choose a UIN that is easy to say or copy. After logging in, open the users list, find a contact by nickname or UIN, and add it in the client. If the contact is not found, try both search options because some old clients handle screen names and numeric IDs differently. Old official ICQ accounts are not migrated automatically, so create a new number and share it with friends.
You need a client, a new UIN, and correct server settings. Use QIP 2005 for Windows, Jimm JAR for a feature phone, or J2ME Loader on Android with the same JAR file.
Jimm is for real Java phones and mobile ICQ nostalgia. QIP is useful for first testing because desktop errors are easier to see and settings are faster to change.