How can I create a custom table in Splunk view that stores some user credentials and How can I create a button that opens the new record form using which users can submit the information in splunk?I have attached an image for reference.
You can make use of the KV store to store information and retrieve
https://dev.splunk.com/enterprise/docs/developapps/manageknowledge/kvstore/
https://dev.splunk.com/enterprise/docs/developapps/manageknowledge/kvstore/usetherestapitomanagekv/ https://dev.splunk.com/enterprise/docs/developapps/manageknowledge/kvstore/uselookupswithkvstore/
Splunk JS can be then used to control the button actions and processing the record.
There were some dev materials available explaining the overall process but looks like its removed. There are some third party documentation available in public for splunk KVStore CRUD