Add new "Tax type" for WET ?

Hi,

I've just signed up to MYOB Essentials online and I can't seem to figure out how to add a new "tax type" ?

I have a wine wholesale business in Australia and I need my products to have 2 taxes added:

Product price + 29% Wine Equalisation Tax + 10% GST = Final price

There's just a list of tax types and I can't seem to be able to add or edit any of them to add the 29% WET to be applied to a product on the invoice.

Any ideas?

Thanks