If you are adding the bank account details for an organisation or business, then you will need to add the personal details of a legal representative of the organisation. This could be a Trustee, Director, Treasurer or Finance Manager. It is okay if these details don't match the project owner details added in the 'About you' section of your project. 

Please note that you will need to upload a form of ID to verify this person's identity, so make sure that they have a passport or driver's licence available to upload.