I've written posts-manual with step-by-step instructions how to use your "Sell Vote" feature
In English: https://steemit.com/steemit/@allfabeta/how-to-get-additional-sbd-and-steems-on-steemit-with-smartsteem

in Russian: https://steemit.com/ru/@allfabeta/dopolnitelnyi-zarabotok-v-steemit-so-smartsteemom