There is no sign-in at this address
klickcourse.com is the marketing site. Accounts live either in the console or on your institution's own address — pick the one that describes you.
I run courses (or want to)Sign in to the console, or create an agency account — admin.klickcourse.com
I'm a studentSign in at the address your course was shared from — it looks like yourschool.klickcourse.com. Verifying a certificate needs no account at all: just open its link.