I am change my apple account but my last account was on my iphone and not download the apps

If you are now using a different account, delete all the apps using the old account and download them again with the new account. If you do not, you will keep on seeing that warning.

I don't use multiple accounts but I suspect you may not be able to keep on switching between the various accounts under which your apps were downloaded. It would be too easy to abuse the system if that were possible.

Put in the password for this account. If you don't know that anymore you might need to reset it at iforgot.apple.com