When you add add-ons to your project through your Concrete5 account then you can go through the Site's Dashboard to the Extend Concrete5 page and install those add-ons. Once the add-ons are installed they will either create Dashboard pages for you to add/update content or they will install blocks in your Block Add menu.

So if you are installing something like a Slider you would go to the front end, click Add Block to the Area that you want to add your block to and then it should give you a long list of blocks you can add, scroll down that list until you see the block that you purchased that you need to use and select it. That should open a window with all of the block options for you and you should be able to customize it however you want.

Thank you. That was quite helpful.