Prerequisites
You must be a team member for this site on Pantheon. The site "owner" can make you a team member. These steps are conducted on Pantheon.
If a Webspark release will require use of Composer (uncommon, will be specified in the release notes), the same required applications apply to these instructions as for adding or deleting a custom Drupal module.
Caution
Do not apply any updates unless you have received official notice that a new release is available. See discussion on the right.
Overview
The following diagram, by Michael Samuelson of ASU's Enterprise Technology (ET), shows an overview of the steps required.