Duplicate content in Shopify reported by Moz

[ycnetpro101]

According to Moz crawl report, there are hundreds of duplicate pages in our Shopify store ewatchsale.com.

The main duplicate pages are:
https://ewatchsale.com/collections/seiko-watches?page=2
https://ewatchsale.com/collections/all/brand_seiko
(the canonical page should be https://ewatchsale.com/collections/seiko-watches)

https://ewatchsale.com/collections/seiko-watches/gender_mens
(the canonical page should be https://ewatchsale.com/collections/seiko-watches/mens-watches)

Also, I want to exclude indexing of pages URLs with "filter parameters" like https://ewatchsale.com/collections/seiko-watches/color_black+mens-watches+price_us-100-200

Shopify advised we can't access our robots.txt file.

How can we exclude SE crawling of the page URLs with filter names?
How can we access the robots.txt file?
How can we add canonical code to the preferred collection pages? Which templates and what codes to add?

Thanks for your advice in advance!

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