After saving, unless you didn't specify another file for it to go to, I would think it went to the brush folder under program files>adobe>ps7>presets. If it is not there, I would do a windows search found in your start menu for the file name. For submitting brushes, sets or individual brushes are both acceptable. Hope this is helpful! Can't wait to see your brushes! -Ali
For those who want to save a set of brushes, go to edit>preset manager. Select all the brushes to be included in the one set, holding down shift key while selecting. Save.