Lockspam allows you to add, edit and delete items in the Allowed List. Double click Lockspam Main Menu (in the system tray) > Options > Filter > Allowed List to make the modification there.

Alternatively, you may choose you favorite word editor and type in an address per line, without any punctuations. Please note, make sure the extension of the file should be ended with ".txt". Then go to the Allowed List tab and "import" the document you have done. It's just that easy.