You haven't provided enough information. Do you have a seed phrase wallet with an additional word, i.e. Bip39 passphrase? Or do you mean you forgot the password to your wallet file? What software are you using? The more detail you can provide the better we can help.
You've been around long enough that I probably don't have to tell you to not post any private keys, seed phrases, or passwords, and don't trust anyone offering help in PM.
I forgot the passphrase to open the wallet to send funds or change passphrase to the locked wallet, but I do have the key for the wallet.
I believe the passphrase is with letters and numbers if seed phrase you mean.