If permitted by your organization, you can create your own original content by clicking the pencil icon at the top of the Social tab. This will allow you to type your own text, include a web address, or attach an image. You'll have the ability to control which social accounts receive your content and whether your post will publish instantly or be scheduled for a later delivery.
NOTE: Based on your organization's compliance policies, you'll be able to either publish the content right away so long as no infraction keywords are detected, or you will need to click Request Approval. This will submit your original content to your compliance team for review. Once approved, your content will be shared/scheduled to your account.