Login to Skedulo Classic (https://app.skedulo.com) and then select "Skedulo Admin" from the user's name drop-down menu–at the top far right corner of the screen.
Under the API User section, you will be presented with a drop-down menu. Select the name you wish to activate and click on the "Activate as API User" button.
The following conditions apply for a user to become an API user:
They have logged in to Skedulo recently.
They have the "View all Data" permission in Salesforce.
They must have the "Manage Users" permission in Salesforce.