Sorry for the inadequate information from me for the enquiry and thanks for trying to guide me here. Indeed, I do have a UCAS account and ID, which have already been sent to the university via the online application.
I understand that I have to wait for the informal offer so that I can add it as my Clearing choice. What I mean is, I have sent my things to the university with none of the responses for several days (it might also regard the holiday maybe?), no matter a rejection or confirmation offer via email. Therefore, I am extremely confused about the status of my application, especially since I noticed that Lancaster contacted those successful applicants on Friday night.