• First Step: Log in to your Tumblr Account
• Choose the blog that have Queue Posts. (This only apply if you have more than your main blog)
• On the Right-Side bar Find the Option that says "Queue", like in the following picture:
• The Queue will allow you to stack posts over a period of hours or days. You can choose the # (number) of posts you want to have per day and between 12am-11pm till 1am-12am. You can also choose your Timezone.
(click to view larger)