Since Updates are sent via email we treat them as such, thus you are not able to recall or edit a sent Update.

If you wish to make a change and re-send an Update that was already sent, you can do so from two places.

If there is a particular Update you'd like to send to more recipients, you can simply click into the sent Update and click Add Recipients in the top right corner as shown below. From here, you'll be able to select lists or individuals you'd like to add.
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If you would like to make some tweaks to a previously sent Update, you can also duplicate the Update and make the changes, add new recipients, and send that way. Screenshot below:

Please let us know if you have any additional questions!