Create A Date Based Schedule

Click on Scheduler from the left sidebar.

Click on Date Based.

Click on Schedule Single Post.

Choose which Social Networks to which you want to post. You can choose one or multiple.

Choose which Content Bucket from which you want to pull images.
Choose which image in the Bucket you wish to use.

Edit the Post Caption if you wish. 
Add a Twitter Comment if you main caption will be longer than 280 characters.
Add in First comment for Facebook if you wish.  

Repeat these steps as many times as you would like.