When creating tasks for Mr. Porter, you must use the SKU or Product Code. The SKU or Product Code can be found on Mr. Porter's site. (Note: Mr. Porter has different site regions for US and GB, SKUs are still the same no matter the region, but Phantom only supports the US region at the moment.)
Once on the Mr. Porter website, click on any product. (In this example, I chose a pair of Common Projects shoes).
After clicking on the product, you will be brought to the product page. Below the add to wishlist button and all the shoe details, you see a section labeled product code. This is your sku to use within Phantom. Copy the number sequence.
Within Phantom, select Mr. Porter as the store (use the arrows on the right to navigate the select a store section). Then, in the URL/SKU field, paste the product code you found earlier.
Then, choose a size or use full size run (see this "How to use full size run" article if you have questions), then choose a quantity or number of tasks you want to create, and then choose a profile. If you would like to use random email and random name on that task, select those options (MAKE SURE if you use random email you have a catchall without an @ in your profile's email field). Select task specific proxy if you want, it is not recommended unless you need it.
Both Residential and/or Datacenter proxies work on Mr. Porter.
High delay (above 5000 ms) is necessary because it is Mr. Porter bans easily and drops randomly.
You don't need a large amount of tasks, but you will likely need more proxies than tasks because they ban. Porter usually drops randomly, so it isn't advised to run for the drop the whole day.