What exactly are you having troubles with? You can use the API-Browser available at https://<firewall-ip>/api to actually go through and figure out the xpath for what you want to modify; that along with the documentation that @emyl79 linked to should get you pointed in the right direction.
@BPry thank you for the pointers. Why is it that when you issue a command for config audit on running config and candidate config the versions are identical?
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