Hello I forgot my old iCloud password and now i have different phone number i wnat to change my phone number can halo me

Hi!

Do you have an access to an apple device which the Apple Id is currently signed in?

If yes, try to add the new on Settings > [name] > Password & Security then tap edit next to Trusted number. Once added, try to change the password.

On mac, go to Apple menu > System Preferences > Apple ID. Then, click Password & Security.

If those are not available, you'll need to initiate the account recovery which will take few days.

If you forgot the Apple ID password, enter the Apple (iCloud) ID, and click Forgot Password. See if you can get a Rescue or Notification  email option. Link to contact Apple Support at the end of the 2nd article.

Apple ID - Manage            

Apple ID – Forgot Password