Hello, Im very new on odoo, and my boss ask me to do something that looks very simple ASAP but Im stuck since Im just starting to learn:

1.  How I can open the view 'website_sale.confirmation' to see the changes Im making?

I have located the view on Settings > Tecnical > Views, and I can see the code, but how I can access the view to see the changes? The only way I have access is by making a purchase, and Im not going to be paying our own product every time I need to test the changes on that view. I have tried to locate the view on the bug button on the toolbar (I dont know how is called) and on the option 'open view' but is not listed.

2. Now the requirement:  I need to add a button that open a link with some info attached as parameter, I have added  the button:

<a role="button" class="btn btn-primary d-none d-md-inline-block"  t-attf-href="https://myportal.net/#/confirmed?email=costumer@foo.org&orderid=xxxxx"  aria-label="Start" title="Start"> Go to your course</a>

But I don't understand very well how to call or add the fields on the url I have tried some examples that I saw on stack overflow or here but gives me an error page or doesn't recognize the fields as fields and the application make me restore the view

Thank you in advance