http://torkh4tt5vafbkcy2spsxppbcnfe57pqtyzhqo4wnzyfvtas4rtjmzyd.onion/help.php
You will know which type of seed you have used by the start of your Bitcoin address, legacy addresses start with a 1, segwit addresses start with a 3 or bc1. For this example we will just go with legacy; Copy your wallet generation seed to your clipboard, or write it down on a piece of paper before pressing next.