My C3000 router has had the username and password changed.

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Plugged wrote:
I’m not sure what to do if I can’t log in on the app, my wifi signal has been horrible recently and I have suspicions of someone using it.

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Not much to go on there.

What do you mean by "can’t log in on the app"?

As to the wifi signal, any other wifi sources around that could interfere with yours? Have you changed the wifi password so that no one else can use it?

Your subject says something about passwords. There are several that you could mean.

One is the password that you get into the browser graphical user interface (GUI) to manage the router. The other is the password you use to access the wifi.

Your C3000, if that is what you own, is a cable modem/router.

While many questions about routers are generic and could be answered anywhere, some things need specialist knowledge.

You might get more help, and find earlier questions and answers specific to your device, in the appropriate section for your hardware. That's probably here:

Cable Modems & Routers

You might like to search there for messages related to your problem.

I will ask the Netgear moderator to move your message.

In the meantime you could visit the support pages:

Support | NETGEAR

Feed in your model number and check the documentation for your hardware. Look at the label on the device for the model number.

Check for various troubleshooting tips.

You may have done this already. I can't tell from your message.

I mention it because Netgear stopped supplying printed manuals and CD versions some years ago and people sometimes miss the downloads.