Frequently asked questions : Accounts - individual

Can multiple users share the same account?
What are the differences between a free account and a premium account?
 What should I do if an email address is already in use?
How do I change my email address?
Can I change my username?
How do I activate a coupon code for a free account?
Will my subscription be terminated automatically?
My subscription has expired. Does that mean all my results have been lost?
Can I transfer an existing account to someone else?
Is it obligatory to fill in the date of birth?
I forgot my password. What do I do?
I forgot my username. What do I do?
How do I delete my account
How do I know when my account expires?