HOW to create login account that shows error?

Question

if I create a program that shows username and password(if the user types a wrong password if should show the error. if he types right and clicks submit it should go to the directed website)pls sh ow me a program of that.....

Answer 1

I will do it wait

Answer 2

a simple one no graphic at all is that okay?

Answer 3

ok

Answer 4

show me