How to change door number?

My Property number is 13, xx street
How to change number to any other number officially?

Sunil - Street names and house numbering are agreed by the relevant local authority and Royal Mail.   You need to contact your local authority to initiate the process. 

Once the re-numbering has been agreed and you have notification from the local authority then you can write to our Citizen Centre and enclose a copy of the correspondence from the local authority to amend the Title Register.  

i have one flat above shop so i need to registered number please help me to register the number. my door number is flat 855a high road leyton e10 7aa

Use our online service to confirm the registered information - Search for land and property information - GOV.UK