Hi @Boppersnr1 ,
Are you confused with Row ID field? It should be identifier of each entity, please find dynamic content likes below red marked and insert it in Row ID field.

In addition, what does this mean? I'm little confused.

If you want your flow works like this, I think the method should work.
1.One column changed triggers the flow.
2.The changed column will be got again after 3 days.
3.Compare previous value and current value, if they are same, then send an email.
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If my answer helps you solve the problem, please accept it as a solution.
If you have another problem, please post it in new post.😀
Best regards,
Rimmon