The option you select here determines which of the search fields are enabled.
Note: You can review a broader list of merchants by searching on the Bank, BIN, Industry SE, or Cap ID fields. This will yield a list of merchants under the specific bank-level identification numbers.
If only one merchant meets your criteria, the AMEX Merchant Registration page for that merchant opens.
If more than one merchant meets your criteria, the AMEX Merchant Registration Homepage refreshes to list the Search Results for Entity in a panel beneath the Search Criteria and Create New Entity panels.