The app will present you with a list of any malware, adware or viruses found during the scan on a screen similar to the one below. From this screen, you have the ability to remove them.
Just select the files you want to remove, and tap "Fix Threats" (please note that by default all potential threats will be selected).
Let the fix run, and wait until your get to the summary page (see below) to see that the threats have been removed and how much room you have left on your device. It will also state whether your device is fully protected.
Tap the field "Fully Protected, Enhance Performance now" to continue to the next step.
Click on the image below to see how your can enhance your Android's performance: