Save the back-office form of the page with its "Save" button and wait for the answer of the back office: a message, a field error, or the list the form returns to.
Examples
When I save the back office form
When we save the back office form
And I save the back office form
Then I save the back office form
When save the back office form
Pattern
When(/^(I |we )*save the back office form$/, …)
Part of @webship-js/prestashop-steps (github.com/webship/prestashop-steps), a step pack for Webship-js 2.0.x.