To make an investment via an entity, you don't need to create a new Wefunder account! As you're making the investment through your account, you will change the "Investor Info" from investing as yourself to your entity using the dropdown menu (you may need to click edit on box 2 to get this option). If you don't have an entity listed in your account, you can click the option that says "+ Add New Entity". Based on how you want to invest, you can toggle this on and off as you make each investment on Wefunder.
Please note that your account legal name should be YOUR name as the manager of the entity. You are allowed to put your entity name as your public name if you wish to do so.