Trying to use machine learning.
the button "create new job" is disabled
Which roles does the user you're logged in as have?
If you can see the jobs list but not do anything then maybe you have the monitor_ml cluster privilege but not the manage_ml cluster privilege?
The easiest way to get the manage_ml cluster privilege is for your user to have the machine_learning_admin role.
See https://www.elastic.co/guide/en/x-pack/current/built-in-roles.html and https://www.elastic.co/guide/en/x-pack/current/security-privileges.html#privileges-list-cluster