To add new plugins or themes directly to a WordPress site:
Step 1: Go to BlogVault website and sign in using your email ID.
Step 2: On the BlogVault site listing page, select the website of your choice.
Step 3: It'll take you to the Site Detail page. In this page, go to the Management section. Here you can click on + Add Plugins or + Add Themes.
Step 4: On the next page you will see a list of plugins from the WordPress repo. You can search for Plugins in the search bar or upload Plugin if you have the file on your PC
If you select Theme, you will get the list of themes available. You can search for Themes in the search bar or upload Theme if you have the file on your PC