Tip:
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Login into WordPress Dashboard
Click on 'Plugins' option
Then click 'Add New' button
Type Plugin's name that you want to install
Lets install 'Wp Minify' plugin
Click 'Search Plugin' button
Click 'Install Now' under specific Plugin listing
Click 'OK' button on confirmation box
Plugin installation will begin
After install, click 'Activate Plugin' to use it
For Plugin settings goto 'Settings' menu
'Wp Minify' is an example, you can install any plugin using this method