Login keychain password

Help me please. I am trying to download software and I must have my login keychain password. I have always used the same one, but it is not recognized now. I have tried every single form and password I have ever used. I have an old macbook.

Is there any way to find this or reset it without reinstalling my original OS X program????

I have spent 4 hours now going in circles... can anyone help me????

thank you so much. carol

Mac OS X: Keychain Access asks for keychain "login" after changing login password

Only way I know. There are two methods there. You will need #2. It will totally reset your Keychain.