I’m not quite sure what page you are starting from on familysearch, so I’ll try and explain what I do to see if the films are digitised and viewable.
From here
https://familysearch.org/search/, go to ‘Search’ - in between ‘Family Tree’ and ‘Memories ‘
Click to bring up a menu.
Go down to ‘Catalogue’.
Click.
In the box under ‘Place’ put in the name of the place you want, eg Paisley. (Don’t worry at this point if you know a specific church, this will come up later).
Wait for it to recognise the place and county, and select the one you want. (eg, there are two towns called ‘Prestbury’, one in Cheshire and one in Gloucestershire, so I’d pick Prestbury, Cheshire).
Don’t worry about the rest of it, just click the ‘search’ button.
You will get all the information about the films they have about that particular place.
If you want the parish registers or BTs, click on ‘Church records’, and it will come up with the films they have.
If you find a film there you think is the one one want to see, see if there is a camera icon next to it, and click on it. If it’s viewable at home, it will load, or it may say it’s only viewable at an LDS library.
If there’s no camera icon, and only a film reel icon, it means you still have to order it from Salt Lake. (Get in before August evidently!).
I hope you can follow this!
If you give me the name of a couple of places I can check them out and send you a link.