If your Chromebook doesn't have a dedicated refresh button, you can use keyboard shortcuts to refresh a webpage or application. Here are the steps:
On a Chromebook, the top row of keys are dedicated "Browser Action" keys rather than standard F-keys. The is the Chromebook equivalent of F5.
If you are using a Chromebook to remote into a Windows PC, or using specific development tools that require the actual key, simply pressing the Refresh button won't work—it will just reload the browser.