I am setting up my wifi on the printer and my password has _ how do I inserrt this on my printer

Click link below for steps to setup wifi for HL-2280DW Wifi setup.

https://help.brother-usa.com/app/answers/detail/a_id/60944/session/L3RpbWUvMTU2Njk1MzM3NC9zaWQvOXZERWdvbm8=?R3ModelID=HL2280DW

When you installed the printer, did you change your network password? Make sure your WiFi password or passcode has not been changed. If you the phone is trying to sign in to WiFi with your printer passcode, it will not.

I had something similar happen with my Brother printer. If the router changed, your printer may know it's not the same router and won't automatically connect. I would suggest going through your printer's wi-fi setup (to connect to your router) again and if that doesn't work, HP's support might be helpful. If you have WPS setup available on both your router and printer, that is the simplest way to set the printer to work with the router.

I've found that when I change out a router, I have to go through and re-enter the password to connect even though the new router has the exact same name. This is probably a protection since someone else in your area may set up an identical router name, so the equipment has to know it's a different router. That's an unlikely situation, but it could happen, so that's why router replacement isn't as simple as setting up the same password and router ID.

configration with laptop if any passward

Open the settings menu on the printer. For the network settings enter the connection parameters. If the printer has WPS you can skip the settings and use WPS to connect.

Dear
The same password, set for the wifi router.
Thanks.

It's possible that the printer was reset back to default. Read the manual for default password when initially setting up WiFi access. Go in and reset to your desired password.

Else, someone hacked your printer and changed its password (just for giggles maybe). Then go into printer config menu (read manual) and reset to defaults, then setup again, using a more comprehensive password (read: harder to guess/crack).

There will be an up and down character somewhere. scroll through the screens.
If you had posted the model number I may have been able to locate an online manual.

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