How to Print Envelopes in 3 Simple Steps. Step 1: Prepare Your Document 📝 Open your word processing software (e.g., Microsoft Word). Go to the "Mailings" tab and select "Envelopes". Enter the recipient's address and your return address. Step 2: Load the Envelope ✉️ Adjust your printer's paper tray to fit the envelope size. Place the envelope in the printer tray according to the printer's instructions (usually face up with the flap on the left). Step 3: Print the Envelope 🖨️ In your word proces