SND Dashboard's Repost feature allows you to take content from any stream and create a new post for one of your connected social accounts. It's helpful for reposting content from other accounts to your main account, or vice versa.
For Facebook posts, you'll find the Repost button in the post menu (the three dots).
Once you select Repost, the original content will appear in a new post composer, and you can select another account and continue to edit the content. Be sure to credit your sources.
For Instagram, the repost button appears below the post itself.
Select your account, and be sure to indicate the original account that posted the content.