Hi,
As I said, you need to go in the menu System>Taxes.
There, you click on the "new" button in order to create a new tax rule.
The thing is that if we do it for you, you'll not learn how to do it and you'll still have the same problem for the next two websites. so it's better that we take the time to explain to you how it works so that you can do it yourself I think.
Of course, if you need someone to add the rules for you, you can ask a partner here:
www.hikashop.com/home/our-partners.html
Let's do a step by step:
1. go in System>Taxes
2. click on the "manage tax rates" button
3. click on the "new" button, enter the namekey "GST" and the value 5% and save
4. click on the "new" button, enter the namekey "HST" and the value 10% and save
5. Go in System>Taxes, click on the "new" button, select the GST tax rate, the zone "canada", and turn on the "cumulative tax" setting and save.
6. Go in System>Taxes, click on the "new" button, select the HST tax rate, the zones "new brunswick", "Newfoundland and Labrador", "Nova Scotia", "Ontario", "Prince Edward Island (PEI)", and turn on the "cumulative tax" setting and save.
That's it. All your products will now have the correct tax for the states for the HST and for the states with only the GST, and then you can create the tax rates/rules for the GST and PST in a similar way.