tax codes for self employed

Good evening, i am new to using quickbooks and wish to use it to track my expenses. i have linked my bank account and when processing the transactions it asks me to choose a tax code. i am a self employed gardener but using the quickbooks online simple start package due to the features, so i pressume the tax codes arn't relavant to my business as i am not vat registered. is there a way of turning this feature off on the android mobile app?

any help is much apprecited