How do I connect/setup my Apple Time capsule to connect to my router via Ethernet only?

I have WiFi IOT issues between my BT Home Hub and an Apple Time Capsule (I think). I would therefore simply like connect/setup the Time Capsule to connect to my router via Ethernet only. I don't understand which port on the TC I need to use, nor how to set things up through the Airport Utility.

Can anyone assist? Thank you in advance.
 
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