Perform various tasks on the site on the Opencart platform

For the site tdom.info on the opencart platform it is necessary:

1. Solve the problem - stopped coming letters about new orders on the site to the mail
2. Products under the order are not displayed on the site, you need to be displayed again
3. Add subcategories in the category, the ability to manually add to a specific category clarifying selection

You also need the opportunity to contact you in the future when new tasks accumulate.
The price is negotiable.