When I try to hack a solution it tells me Illegal contest ID in Codeforces Round #627 (Div. 3). Any suggestions?

Firstly, google chrome, my default browser, doesn't support UVA at all. Then, I tried firefox. It is better, but it doesn't support it completely. Does anyone know any browser or any way to make UVA fully supported? I'd really appreciate your help.

How to change the default code that appears every time a new project is created on codeblocks?