How do i post animtions and images in a post so that other forum viewers can view them?
You have to get some web space. Don’t use Geocities, it is very unreliable for what you are looking to do.
http://www.photobucket.com/ is a good image hosting site. There are also some Blender specific galleries, like Mudpuddle.
I am not sure about movies. If you have a website you can link from there, but again, you don’t want to be doing that with Geocities. Use Google, or any other search engine… you are bound to find something good.
To insert an image on a page, insert [lMG]http://www.site.com/image.jpg[/img], and replace the address with your image’s location.