Simply walk up to it and press 'A'
ring the bell
Stand next to the door and ring the bell
In Animal Parade, there's no set order to ring the bells. However, you'll have to ring the Blue Bell before you ring the Green Bell. Also, the Purple Bell has to be the last bell you ring: they won't let you ring it before all of the others are rung.
There is one in Harmonica town and there is one in Toucan island but you need to ring the blue bell first.
That depends on who you want to marry. Some people don't move to the Island until you ring a certain Bell. If you want to marry the Harvest Goddess or Harvest King you will need to ring all the Bells. It might be the same for the Wizard and Witch but I am not sure.
You can either push it out the back door, or ring the outside bell in the pasture.
I do not
Actually, I think the Blue Bell is the most complex >.< Here's a good explanation: http://fogu.com/hm/animal_parade/the_blue_bell.php
You can not meet him until you ring the Blue Bell. After that you can find him, most of the time walking around the dock.
There are a few different Harvest Moon games for the Wii. Always include the full title so someone can accurately answer your questions. Harvest Moon Magical Melody: The Harvest Sprites will introduce themselves at the start of the game. You can see them whenever you want by going to the Goddess Spring. Harvest Moon Tree of Tranquility: Get both halves of the Quilt and then water the Flowers that grow under the Special Trees found around town. There is one in the Town Square, near Brownie Ranch, and in Maple Lake District. There are two more after that but you can not reach those until you help the other Harvest Sprites. Harvest Moon Animal Parade: Speak with the Harvest Goddess and she will tell you about five Bells. Find the missing Bell to meet the Harvest Sprite that goes with it. You won't be able to see the Sprite again until you place his Bell on the correct Bell Frame. Once you put the Bell back on, ring it and then the Harvest Sprite will return to the Goddess Spring and you can visit him whenever you want.
Ring all Five Bells and then Summon the Harvest King.
The barn your animals are living in should have tall bell in the front. Ring it, and your animals will start to walk out (Kinda like hypnotized zombies) :)