1. Log in WordPress dashboard.
2. On the Dashboard menu, go to Plugins then click on Add New.
3. In the next step, use the Search filter to find the plugins. For example, type Security to find other plugins related to it.
4. The plugins that match your chosen keyword will be displayed. Click on "Install Now" next to the plugin's name.
5. Please note that the installation process can take a few moments. Once the Activate option appears, choose it. Also, if a plugin requires a setup, it will display an option to complete it.