Your goal is to send emails, using that specific plugin isn’t a requirement.
Therefore, I suggest you install and activate instead the WP Mail SMTP plugin.
Once it’s active, go to Settings > WP Mail SMTP to configure the plugin settings.
This will ask you to enter the email address and a from name (similar to the picture you shared).
What comes next can be tricky.
First, choose the mailer. For your case, select Other SMTP.
After that, check the box Return Path.
Next, you need to set up SMTP options (SMTP host and port, encryption, select authentication toggle and provide your SMTP username and password), just like you did in your image.
Then there’s a testing tab which you can use to test if everything works fine. It’s very straightforward.