You don't have to write the name of the new couple. If you want to write, don't write until you know the real name of the new person. If you make a mistake, it will cause embarrassment. If you don't write, they will know it's for them.
If the format is vertical, your signature should be written in the lower left corner, if it is horizontal, it should be written in the lower right corner.
4. Congratulation can be written in many sentences, but it is best to use four. If there are too many words, it may bring inconvenience to newcomers. After all, the area of red envelopes is so large.
If your relationship with lovers is just ordinary friends, or even more general, just write your name on the red envelope, there is no need to write more greetings.