To send an email, you require an email account. There are various companies on the internet such as yahoo, Gmail and hotmail that provides you an email account. Register an email account with one of the many email account providers.
After registration, you have to log into your email account and from that area you will be able to send and receive emails. To send an email you have to compose one and after composing an email you have to hit the send button and your email will be transferred to the desired email address.