PictureMePro has the ability to use your email account and act as an email client. To make this work, you do have to enter the correct values on the Settings tab. In the Email address, enter your full email address, for example MaryJane@icloud.com
The username for iCloud accounts is the same as your email address, for example MaryJane@icloud.com
For the password, if you are using an iCloud account, you need to create an app specific password. You can find apple’s instructions on how to do that here
Once you created your app-specific password, paste it into the password field.
The smtp server for iCloud is: smtp.mail.me.com Enter that in the Mail Server field. Then click on the test button.
This should send an email to your custom email address from the PictureMePro app directly.
But you can also stick to the built-in email functionality by unchecking the Custom checkbox on the Settings tab. Then all you have to do is customize the Email text and Full Name.
If you cannot get the built-in email to work, your network environment could be blocking it. As a last resort you can always drag and drop the picture from Results folder onto your Mail client to email it.