Connecting OpenWrt router to verizon homefusion router

I have a verizon homefusion network which has a 4lte router. I have had a cradlepoint router attached with the verizon router as the WAN source. This has worked fine with a Networx program used to measure data usage. But I would like to measure data usage by device. So, a tl-link router, openwrt firmware, and yamon program. Problem, I cannot get these routers networked together. Help Please!

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