Firstly, go to the Contacts tab:
If you opt for exporting the whole database at once, click the Export button located over your contacts and select the Export All option:
If you opt for exporting particular contacts, check them first, then click the Export button and choose the Export Selected option:
Within minutes, you should receive the email with all exported contacts in the Excel file.
In the same drop-down, you can also check the log of all executed exports. This is really helpful when verifying how many contacts coming from Prowly's Media Database were gathered in the generated file.