Documentation Links
Key
You can cancel a previously created key which will disable that key and create a new one. You can also Disable all API access on the account (which would require you re-enabling it later if needed).
Options
You can check off to include payrate information in API results and also enter IP addresses to restrict API access to those IPs. Multiple IP addresses can be separated by commas and you can use an asterisk for the last portion of the IP to cover all numbers in the last portion.
Click Save after setting options.