1- Install and add an Account on Metamask

First you need to add Google Chrome Exstension Metamask https://metamask.io/ then:

Create an account on Metamask

1 - Click on the “Create a wallet” button

2- Create Password of at least 8 characters

3 - Click on “Create” and then write down your backup phrase.

Now ou have a Metamask account. If you already had a Metamask wallet, just click the "Import Wallet" section and fill the private key (a string), you will immediately access your own wallet.