To enable email alerts and scheduled reports on the system you must input SMTP settings for an email account. You can do this in the Reseller SMTP settings section in the admin panel.
If you do not have an SMTP server for your email, you can setup a gmail or mailgun free account to get started
MailGun also offer paid plans for high volume emails, the free version will limit the amount of emails it sends per hour.
First sign up for a gmail account, then navigate to the smtp settings section as directed above, then enter the following settings:
SMTP server: smtp.gmail.com
Port: 587
Use SSL: YES
From Email: youremailaddress@gmail.com
Email Password: YourEmailPasswordGoesHere
Google Gmail require you to allow "less secure apps" (allowing 3rd party app to send emails).
You can find some more information for this here https://support.google.com/accounts/answer/6010255?hl=en
It should look like this:
Once you have enabled less secure apps on your gmail account, send yourself a test email, it is the last option on EMAIL SMTP SETTINGS