This is a test of commonsense. Complete the next sentence:

How to change trading name for a sole trader 
Contact the relevant offices. 
Each country has a different process for changing a legal business name. You should contact the government agencies you registered your business with when you opened it.
They can tell you the process for changing your business name and can give you the necessary forms to fill out. Go through your papers and find all of the agencies you registered with.