Create a new piece of content or edit content in your library to set it up for recycling.
You can add multiple captions to recycled content, making each post feel like a fresh piece of content by clicking "Add Another Caption" button underneath the textbox where you inputted the first caption.
Once you add all the captions you would like, you can scroll down to the "Recycle" toggle so the captions will rotate through once you schedule the content again.
You can also view multiple captions in post previews by clicking the arrows to switch captions when you click to view the post in the Content Library.