In Photoshop, go to File > Print
The Photoshop print dialog / preview appears.
Notice how the preview looks wrong. This is because we have yet to define the paper size being used.
1 - Select your printer in the Printer drop down menu
2 - Click Print Settings to launch the Printer Property dialog.
NOTE - Do not forget to set the media type, quality, and color management settings along with the paper size.
The printer property dialog appears. Locate and click on User-Defined in the Paper Settings area.
The User-Defined Paper Size dialog appears.
1 - Name the new size
2 - Set the paper width and height using the table below.
The width is always the smaller dimension of the paper.
The height is always the longer dimension of the paper.
Regardless of card orientation.
3. Click the Save button.
4. Click OK - You are returned to the Printer Properties dialog.
Verify your printer settings - media type, color management, print quality, paper feed, paper, size, and click OK to return to the Photoshop Print Preview.
1 - Click the Landscape orientation button
2 - Note how the preview changes and looks like a printed, unfolded card.
You can now click Print.
You may see this warning - if so click Proceed.
Congratulations! You have set up and printed a Red River Paper greeting card.