When creating a Finish Line task, you will need obtain the link of the product.
Select Finish Line as the site, and paste the link into the URL/SKU field.
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 Finish Line, but most Datacenter proxies are now banned.
Mid to high delay for drops is recommended because Finish Line bans hard, so 2500 - 7500 ms is recommended.
Finish Line is queue based, so the more tasks the better. Finish Line does ban so go at least 1:1 in terms of tasks to proxies, and as close as you can get to 1:1 in terms of credit cards/unique payment information to tasks. Start less than 10 seconds before the drop starts.