JOINING A STANDARD LEAGUE
To join a Standard league, go to the League Directory or Live Draft Lobby, where you can join the right league for you. You can select between Rotisserie or Head-to-Head and Autopick Draft or Live Online draft. Once you have found the league you want to join, click on the league name and click the Join This League button.
ACCEPTING AN INVITATION TO A PRIVATE LEAGUE
Some leagues are private and can only be joined if invited to play by the league's creator. All invitations are sent in the form of an email which contains a unique URL. This unique URL is the ticket to play in the league. To accept the invitation, the URL must be clicked on or it can be copied and pasted into your browser's 'Address' field. Upon a successful join, your ESPN.com Member ID will be associated with a Team ID and you will become that team's owner.
NOTE: Only league creators can invite people to play in their private league.
Alternatively, if you know the League name and password, you can join a Private league via the League Directory page (Click on "Join League").
Click the filters for League Type (Prize-Eligible) and Access (Private), type in the name of the League in the Search box then click on the "Search" button.
A list of leagues matching the search criteria will be listed below.
Click on the League Name link you wish to join. You will be brought to a summary page that lists all of the particulars for that league, including scoring settings.
Type in the password (case sensitive) and click on the "Join League" button.