the numbers are UNIQUE so you cannot use another persons
I emailed them as I could not log in
they replied
Dear Mail Rewards Customer
Thank you very much for registering with Mail Rewards Club, the
brilliant new Rewards programme that offers loyal readers a choice of
free Rewards they really want.
Your activation request has been received and your account will be
activated within 3 working hours of your email being received. Please
note our working hours are 8am to 6pm, Monday to Sunday.
This email address should only be used for activation requests. Any
other requests sent to this email box will not be processed. If you
have any other query, please Log in to your account and send a
message through the message centre.
Best Regards
Mail Rewards Team