In MyRepChat, you have the ability to create a recurring message from a list of frequency choices. This is great for anniversaries, birthdays, holidays, etc..
From the Dashboard, click on 'Scheduled' then at the bottom click on 'Compose Message':
Enter the contact details in the 'Contact or Distribution List' field and click on 'Begin Search':
Click on the contact and the 'Compose Scheduled Message' screen will come up:
From here you can create your message and choose if it's recurring under the 'Frequency' drop down.
Click 'Save Message' to add this to your recurring messages list. This will now be sent by MyRepChat on the appropriate date.