If you subscribe to Mr Sunday Movies on Patreon you can use use your pledge there to get access to the Big Sandwich content if you pledge more than $9 per month (before local taxes).

When you are on the front page of Big Sandwich select Register from the menu. Then use the Login With Patreon link. The site will ask your permission to connect to Patreon to confirm your pledge level. You will then be redirected back to Big Sandwich and logged in.

You will need to reset your Big Sandwich password so you know what it is. Then in future you can log in to Big Sandwich with the same email address you used for Patreon and your Big Sandwich password. These are also the details you use in your podcast app to access the feeds.