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”