There are times when you need to manually enter data into the domain list. For example, some registrars do not provide the expiry dates in their port 43 whois records. In such cases you can manually add the expiry date and then lock the data so that it is not overwritten accidentally.
To manually edit the domain records, use the Details View.
The details view (easily accessible in the lower panel of the software window) allows you quickly view and edit the data corresponding to domain.

Whenever you manually edit or enter a data for a domain, the entire recordset for that domain is automatically write protected. This will prevent the manually entered data from being overwritten due to a whois lookup.
Write protected domains will display a [] around the index number for the domain (the "#" column). A ~ in the "# column" indicates that the domain record was manually altered.
Write protected domains will not be lookedup again. So you will need to un-set the write protect status to re-enable whois lookups for that domain. You can do this by right clicking the domain in the main list and selecting the appropriate option or unchecking the write-protect check box in the details tab.