Upon your first launch of DeltaWalker after installation this dialog will prompt you to provide the license key—trial or permanent—that you've received from Deltopia, together with optional information that will be used to personalize your DeltaWalker copy. Copy the license key from the email you've received from Deltopia and paste it into the License key field. Alternatively, you can type the license key, however keep in mind that this is a rather error-prone method.
As soon a valid license key is entered, the banner text of this dialog will acknowledge this fact and the OK button will become enabled. At this point you may personalize your copy of DeltaWalker by filling in the remaining, optional fields. With or without entering personal information, clicking the OK button will launch DeltaWalker for a first time.