Modification of the site on Webasyst (Shop Script)

There is a website on Webasyst
A copy of the site on the hosting was lost.
In order not to restore everything again, they deployed from another of their sites.
Now you need to remove all the unnecessary information of the donors site.
Customize the template
Redo contact information
Insert Logo
Banners
fav icon
On an ongoing basis, you need help in improving the sites
Plugin installations
SEO promotion
Maintenance of operability