In Zaxaa as affiliate you have to know which product you want to promote first. Then you need to know affiliate page of the product. You can ask seller directly for this information or you may ask us which product you do want to promote so we can give the affiliate page URL of that product.
After you know the affiliate page of the product you can go there and you'll be asked to signup as free (for affiliate account) if you don't have an account yet. After that you can start to promote the product.