User and pass place holder issue

Questions
1

hi im a noob and trying to make a config for a test site when i use

and in the request content i get

CompilationErrorException
(7.85): error CS0103: The name user does not exist in the current context.

i understand its a noob mistake can anyone tell me how to fix it

many thanks

also if you can recommed me some learning material i will be very grateful

2

needs use <input.USER> or <input.USERNAME> and same for password.