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Steps for Installing a Plugin:

1. Log in to your WordPress dashboard.
2. Go to “Plugins” in the left-hand menu and select “Add New.”
3. Click the “Upload Plugin” button at the top.
4. Click “Choose File” and select the plugin file from your computer.
5. Click “Install Now” to start the installation process.
6. Once installed, click “Activate” to enable the plugin.

Steps for Installing a Theme:

1. Log in to your WordPress dashboard.
2. Navigate to “Appearance” in the left-hand menu and select “Themes.”
3. Click the “Add New” button at the top.
4. Choose a theme from the list of popular themes or click “Upload Theme” to upload from your computer.
5. Once installed, click “Activate” to apply the new theme.

If you mistakenly install a plugin as a theme, it can cause the “style.css not found” error. This occurs because plugins and themes have different file structures, and WordPress expects specific files, like “style.css,” to be present in particular locations depending on whether the installation is a plugin or a theme.

The error message you encountered likely occurred because the theme/plugin package was in .rar format. WordPress only supports the installation of themes/plugins in .zip format, so you need to extract the contents of the .rar file first.

To do this, use a file extraction tool like WinRAR or 7-Zip to extract the contents on your computer. Once extracted, you should see a folder containing the theme/plugin files in .zip format. You can then upload and install this .zip file through the WordPress dashboard like any other theme/plugin.