How Do I Connect a Time Capsule Hard Drive To My Mac?

I use my time capsule hard drive to store my films and tv programes on I have connected to my MacBook by usb caddy and it showed up so it was easy to move files around and add thing I have tried to connect the hard drive again and it shows up as unreadable but the content is on there I use a 2015 MacBook Pro running Mojave connection by usb caddy our wifi is awfull any help would be appreciated
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kevin wall