Sorry, you cannot. There's a one-time $24.99 charge for the first team you enter in the Yahoo! Sports Fantasy Football PLUS contest (all additional teams will receive a 50 percent discount if purchased using the same Yahoo! ID). This charge is billed to the credit card you provide during registration or as part of Yahoo! Wallet registration and is not refundable.
Please note that teams may only be played under the Yahoo! ID with which they were created, and may not be transferred to another Yahoo! ID or played by another person.
If you want to create or join a league with your friends, you must each sign up for your own team separately using your respective Yahoo! IDs.