This article outlines how to deactivate a resource and/or a user, plus how to unassign a Skedulo license.
Deactivating a resource or user will not free up the assigned Skedulo license. You must also remove the Skedulo license from the user.
Also, see Allocating Jobs (Resource Is No Longer Active in CRM).
Open the resource in Salesforce then click the edit button. Uncheck the "Is Active" field and save the resource.
Open Setup in Salesforce.
Under Users, select Users.
Locate the User you want to deactivate, then click the Edit button.
Uncheck the Active field and save the User profile.
The Skedulo license will still be counted unless it is unassigned from the user.