After the installation, you must first create a new wallet
First select the currency for it ...
... and then click on Create Wallet
Give the wallet a name and set a secure password
In the next step, you will be presented with a series of words that you can use to restore the wallet
Note them down well and pay close attention to the order of the words
Enter the words again in the correct order ...
and confirm that this is the only way you can restore the wallet
The Yoroi Wallet is now ready for use