how do you upload the web site created on the computer and how do you edit it once you have uploaded it.

Edit on your PC and upload the changes.

Although Bravenet do supply on-line authoring tools they are not the best way to maintain your site because:
1. You have no backup if anything goes wrong at Bravenet
2. It makes it difficult to change web hosts
3. You end up showing your mistakes to the world instead of being able to check your page first.