Merge related orders made by a same customer/guest into an unique order.
This module takes the role when the same customer/visitor places more than 1 order.
Therefore, at first step, try to make some purchases.
These purchases can be done by a customer account as well as a visitor account (Guest checkout).
Then, go to the back office, navigate to Orders page > View an order.
All other orders are listed in "Other orders" block. Now, you have a chance to merge them into one.