I just recently made a texture called Ty the Hedgehog and this will sound dumb but how do I put anything in my vault
First you upload it to a site such as Mediafire. Then you upload it to the vault.
To upload it to the vault go to Brawl Vault and look for submit. It's pretty self-explanatory once you get in there. Also load up some picture previews on a picture sharing site so that you can show pics of your creation (you will also link these in the submit page).