The first step is to connect with trough Steem Connect with your posting key, allow and authorize it.
Second step, you need to keep in mind that you need to schedule each post manually with Steemauto. You write your post, title and content with Steemit, Busy or an offline editor. Then paste the data into Steemauto.
Steemauto allow only to schedule every hour, so you need to schedule accordingly. You access the feature under Schedule posts!