Apple ID/iCloud issue

I have recently updated my Apple ID email from a now obsolete one to a new one created. I have since tried to updated apps on my iphone and use icloud on my macbook pro,to no avail,as my apple ID on both devices has not been updated. it obviously has stopped me from performing several tasks,and I would like to know how it can be resolved,and also what I did wrong

Regards

HB