The following instructions are based on using PhpMyAdmin. If using this is accessible through the Siteworx Panel

Look at the eav_entity_type.entity_type_code for the "order" record as seen here

In this example we will see the entity_type_id = 5

Go to the eav_entity_store table in the MySQL Database and edit the record with entity_type_id = 5

Enter the new next order number as seen here and hit Go

NOTE: Make sure to keep the order number 9 characters long