Go to the settings in Qraia by clicking on your email on the right top and click on "Settings".
Fill out the settings for your email.
Host
Gmail: smtp.gmail.com
Yahoo: smtp.mail.yahoo.com
Hotmail: smtp.live.com
Outlook.com: smtp-mail.outlook.com
If you use gmail, you probably get a warning that you need give access to less secure apps.
You can do that here: https://myaccount.google.com/lesssecureapps?