You can Edit Assets and Collections within Dispatch via the "Edit Asset" or "Edit Collection" buttons found throughout the UI. See examples below.
Asset "Quick View":
Asset Detail Page:
If you have "Edit" permissions on the current Workspace, then you'll be able to click those edit buttons. Clicking will slide in the Edit Slider on the right side of the screen. You can make the required edits then hit save.
HINT: If you're unable to click the Edit buttons, then that means you need a Workspace Admin to give you the Edit Permission. They can do that by emailing firstname.lastname@example.org or requesting at this link: https://goo.gl/forms/KELvRLQt6DeJVJhg1
Edit Asset Slider: