I got the welcome letter from UCAS on Jan. 12, so it has been 10 days since I sent the application. Since I am an international applicant and didn't have access to a lot of info on how UCAS and UK system work, there was a misunderstanding when I applied regarding insurance and firm choices -I basically thought I could declare the unconditional offer as an insurance- and now I wonder if I still can change the course of the same university. And if so, 1) should I email to the undergraduate admission? 2) would changing the course be a disadvantage against my application?