Hey! My husband has switched our internet - now the apple routers your installed don’t work- have no way of knowing how to get those working apparently there is a password- can you let me know what to do?
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There are many things that could be going on. It would be very hard to guess what the problem is without more details. Here are a few possibilities:

1. The new internet service provider has overridden the previous routers by turning on wifi with the new one.
2. The new router could have the same name as your apple routers.
3. The apple routers could have been disabled (turned off).

The two difficult things for me to work with via online session are printer and wifi issues. So this is more of an in-person type of problem to solve. We could attempt to adjust the network via remote session but it could possibly not go well. If we were to make changes to your wifi network remotely, without me being there, I could make a change that would require an in-person visit. So without more information, this is a difficult problem to guess at.