Download Prestashop - 1.4 User Guide

You need to set delivery rules for each carrier. Click "Add Now" to find
that form.
Unable to embed resource: 173-modules-deliveryDateAddNew.png of type
application/octet-stream
You should create as many delivery rules as necessary.
Set the remaining module options, and finally click "Save".
Dejala.com : Courier delivery
Once you sign up with Dejala, the module allows you to add
supplementary delivery services. When your clients purchase a product,
they will see the shipping options available with a detailed time slots. They
will order the product and ask for it to be delivered during the time slot
that works best for them.
You must have a Dejala account in order to use it. you can create one
right from the module's configuration page. Once you have your account,
sign in using the second form in the module's configuration page, and
follow the instructions.