To attach a gift to a letter in Animal Crossing for GameCube, first open your inventory and select the item you want to send. Then, choose the option to write a letter and select the recipient. During the letter-writing process, you'll see an option to attach an item; select that and choose your gift. Once you've finished writing the letter, send it off, and the recipient will receive both your message and the attached gift!
If there is no Erase button (Which I'm assuming you would of seen) then the only way is to wait for it to 'Expire' or write more posts on the board until it goes off.
You can't
When you talk to the animal that gave you the letter, he/she will be mad at you.
you can't
It is impossible to send a letter to any of the shops/buildings in the town and/or city in Animal Crossing City Folk. Letters can only be sent to other town folk.
yes
no you cant 9 (sadley)
Go to Tom Nook's Store, they come in a pack of 4.
No, unless your actual mother has a character in the game.
you get a letter from mom. Inside of it, there are pink carnations
You cant because she is not in your town.
No sorry I'm afraid you can't. But what you can do is maybe let Coco come to your place or you visit her and maybe you can act as if its a date there or you could go for a walk with coco.