To whitelist a selection of IP addresses, navigate to Configuration > Security > IP Access List.
Click Create New.
Add the IP address you would like to whitelist in the field boxes.
NOTE: To whitelist a range of IP addresses (rather than one IP address at a time), use a dash in the final field box to indicate a range between two ending numbers. For example, if you want to add a list of IP addresses from 100.200.300.1 to 100.2000.300.100, you would include a dash in the final field box, like the sample below: