If OP lost the 12 words seed, unfortunately, that's unrecoverable. Upon wallet creation, there's a TOS that you agree with,
"I understand that if I lose my recovery words, I will not be able to access my wallet.", see on this
article for further information.
But if you lost only your password not the 12 words seed, that is very easy to change.
Clear cache the app -- open your wallet app -- click "
I have already a wallet" -- select "
Multi-coin wallet" icon -- Enter your 12 words seed -- and create a strong password. Everything is recoverable if you have a recovery seed, remember always "
Not you key, Not you Coins".