Quebec and Ontario Hikashop custom made sofa

-- url of the page with the problem -- : www.custommadesofa.ca/
-- HikaShop version -- : 2.3.4

All comments are welcomed (if critics, please put a suggestion or fix!)
Website has been up and running for the last 1.5 years now.
Soon will be the associated importer for all Quebec and Ontario province!

I have just activated the affiliate program options (still trying to figure it out. Looking for a step by step and how to guideline)
I want to give 10% on total sales up to 10k.
More than 10k 15% (not sure how to make it. Must be a custom php tweak?)

Thanks in advance for the lookup!