To mail an envelope, follow these basic steps:

1. Write the sender’s (your) return address in the top left corner of the envelope. This should include your full name, street address, city, state, and ZIP code.
2. Write the recipient’s full name and mailing address in the lower center of the envelope. Include the recipient’s name, street address, city, state, and ZIP code.
3. Affix postage (a stamp) to the top right corner of the envelope. The postage amount depends on the size, weight, and destination of the envelope.
4. Place the letter inside the envelope, seal it.
5. Drop the envelope into a mailbox, a collection box, or bring it to a post office location for mailing.

Additional tips:

• Write addresses clearly and neatly.
• Use capital letters and avoid abbreviations for clarity.
• The return address is optional but recommended in case delivery issues arise.
• If mailing internationally, format the address according to the destination country’s postal requirements.
• The stamp cost for standard U.S. letters is around 63 cents but can vary.

This covers the essential procedure to properly mail an envelope ensuring it reaches the intended recipient efficiently.