I install openvas on kali linux but the password i cant find it how can i find the password or any method to open application
When choosing the category for a topic please try to have a look at the category description for each category first:
The current used category is/was https://community.greenbone.net/c/vulnerability-tests (Description: About the Vulnerability Tests category) which is about vulnerability tests (the so called “NASL scripts”).
Your question is completely unrelated to the NASL script itself but the installation of GVM via 3rdparty packages so i have moved this topic into the better fitting https://community.greenbone.net/c/gse (Description: About the Source Edition (GSE) category).
In addition to the above please note that the Kali packages are provided by a 3rdparty (a so called uncoordinated integration) and are out of the control / knowledge of Greenbone.
Please read the documentation of Kali how the integration was done and how to work with it.