Prestashop Multistore + free modules Configuration

I need someone to configure 1 multistore in my Prestashop store. I have tried to do it without success, so bear in mind that there might be problems doing it. I also need to get some free modules working : the cross selling, the customer follw-up and the product review one. They are configured but do not display on the site, so this has to be fixed. Thank you. Only 1 day will be allowed to do the work and it will be this week.