If you temporarily deleted a shared file or folder from your account, and you'd like to restore it so that you can have access to it again:
- Sign in to dropbox.com.
- Click Files.
- Click Sharing.
- In the Folders you can add to your Dropbox section, find the folder you previously deleted.
- Hover over the folder.
- Click Add.
If you permenently deleted the shared file or folder from your account, or if the owner of the shared file or folder unshared the folder with you, only the owner of the shared folder can give you access again. They can do so by sharing it with you.