You can edit published presentations/slidecasts. All you have to do is click "Edit" and make the changes you want. For the slidecast editing all you have to do is record your slidecast again.
Warning: Once you re-publish a presentation/slidecast, it overwrites the previous version in LIVE mode!
All changes are instantly visible wherever the presentation/slidecast is already embedded. You don't have to copy and paste the new embed code, unless you have changed the size of your presentation widget.
When you use points to activate a presentation's premium options, it will remain editable for 24 hours only. Snack VIP and Slide Pro members can edit premium presentations without such time limitations.