You will be taken to the correct page for your browser choice, click the button to add YOROI to your browser.
After checking your browser you will be asked to confirm you want the extension adding to your browser.
You may need to click "Extensions" and then "Pin" Yoroi to the top menu bar.
When you click the YOROI button for the first time you will see this screen where you can choose your language. if you chose other languages to English the following images will look a little different.
Put a "Tick" in the box to accept the terms & coditions, and click the button "Confirm".
Click "Allow" and then "Finish".