In the Primary Domain text field, the domain currently set as primary is displayed. Use this field to change it to another existing domain.
The SSL Random File text field is used to specify the path to the file with random seed data, used first by the SSL library to seed the random number generator.
To have the disk input/output buffering activated, please check the Enable disk I/O buffering option.
To upload a license key file in the WebAdmin interface, hit the Upload new key button and browse to its current location on your computer. After successfully uploading it, all the details relative to the license type - including company, expiry date, version, included addons, and different counters for mailboxes, domains, etc - will be displayed.
When you are done configuring these parameters, remember to hit the Save Configuration button to preserve your changes.