Sometimes the Validation email does not automatically send, to send it manually please go to option --> Account info, From there, check the email address you entered during sign up is valid, and then press "Send validation email"
Then please wait a few mins for the email to arrive in your inbox
Note1: Sometimes the email is misidentified as spam and may be places in your junk mail folder, please ensure you have checked this
Note2: Using aol addresses has known issues, if you have signed up with an aol email address, please use another address (Many free email providers can be found using a search)