Meter Readings

New customer, I receive an e-mail asking me for a meter reading.

Clicked on the e-mail ‘give reading’ link, sign in, but unable to find a further link allowing me to enter my meter reading and wondering why I have to come here to find that link… if it exists at all?

Also; I am advised that I can sign in ‘using another e-mail address’? Why would I want to do that?