Go back to JavaKiba.top (or its current mirror domain). The password is almost always displayed on the download page—often in a colored box, in the article body, or as part of the file name.
./rzcracker.sh -r /path/to/secret.rar -d /path/to/passwordlist.txt -v rar password list for javakiba top
If you have a list of potential passwords (often referred to as a wordlist), you can use software to try them one by one. This method, known as brute force, can be effective but also time-consuming. Go back to JavaKiba