Make sure your ledger is setup with the Cardano app on it.
Grab Yoroi for your browser or mobile device over at https://yoroi-wallet.com
I am adding it to Firefox in this instance. You can see the “Add to Firefox” button to add Yoroi to your Firefox browser.
Once the plugin is installed you will see the blue Yoroi icon in the top right corner. You can also find it under your browser extensions list.
After selecting your language and agreeing to the terms you will be prompted to pick your wallet mode. You can change this later so it is not a big deal. For just about everyone pick “SIMPLE”
Select hardware wallet
Select which hardware wallet you want to use. In this case we will select the Ledger
Select the current era (Which as the time of writing is Byron)