Change Your Password
There are multiple ways to change a password in SearchStax depending on context.
If you are locked out of your SearchStax account, use the password reset link on the login page.
If you are logged in to SearchStax, but need to change your password because it is about to expire, navigate to the User Preferences > Password page.
Users and passwords associated with the Solr Basic Auth feature can be managed from within SearchStax. Visit the Details page of the deployment and open the Security > Auth page. The SearchStax admin can edit the Solr users and passwords from there.
As a footnote, it is also possible to set Solr Basic Auth passwords procedurally from the Searchstax Provisioning API.