forget password and I can't connect wifi to reset password

Hi, start a new topic & post an etrecheck report if you can...

EtreCheck is a simple little app to display the important details of your system configuration and allow you to copy that information to the Clipboard. It is meant to be used with Apple Support Communities to help people help you with your Mac.

http://www.etresoft.com/etrecheck

Why i can't connet to wifi

An apple article is there : Change or reset the password of an OS X user account - Apple Support

If the user account is associated with an Apple ID, and you know the Apple ID password, then maybe theApple ID can be used to reset your user account password. In OS X 10.10 and later, this option also works with FileVault, but only if you enabled it when you activated FileVault. It's not retroactive. Otherwise, see below.

Note: If you've activated FileVault, this procedure doesn't apply. Follow instead the instructions on the above-linked page, under the heading "Reset using the Reset Password assistant."

Start up in Recovery mode. When the OS X Utilities window appears, select

Utilities ▹ Terminal

from the menu bar at the top of the screen—not from any of the items in the OS X Utilities window.

In the window that opens, type this:

resetp

Press the tab key. The partial command you typed will automatically be completed to this:

resetpassword

Press return. A Reset Password window opens. Close the Terminal window to get it out of the way.

Select the startup volume ("Macintosh HD," unless you gave it a different name) if not already selected. You won't be able to do this if FileVault is active.

Select your username from the menu labeled Select the user account if not already selected.

Follow the prompts to reset the password. It's safest to choose a password that includes only the characters a-z, A-Z, and 0-9.

Select

 ▹ Restart

from the menu bar.

You should now be able to log in with the new password, but the Keychain will be reset (empty.) If you've forgotten the Keychain password (which is ordinarily the same as the login password), there's no way to recover it.

Change the password by going to system preferences > security & privacy > general . click on change password .a screen shot is there to help you .

Now , your mac is opened but still you do not remember the password or you have not written the password .

So, once again you log out the same situation will be created .

Going to recovery mode was temporary method in this scenario .

You have to change the password & fill up hint field .