In order to send message to affiliate (rather than provided email content templates) you can use Bulk email feature to send private message to one or all affiliates in your system.
Go to Emails section, click on Bulk email button:
2. Then fill in email content and choose the affiliate you want to send email to.
You can whether enter affiliate emails or choose a program (when choosing a program, all affiliate on that program will receive your email)
Be noted that sender name will be set to email@example.com as default, if you want to choose your email to be sender email, activate Use merchant email as sender email feature.
3. After that, click Send Emails, our system will show the total number of sent emails.