To add (directly import) members to your group:

1. Click Members from the list on the left of any page.
2. In the upper right, click Invite People.
3. Scroll to the bottom of the page and click Add Members from an existing email list.
4. Enter the email addresses of new members you want to add, one per line.
5. Click Continue.
6. Review the list of email addresses to be added. To add the new members, click Continue.
7. Now, review the welcome email that will be sent, click Add Members.

Please note: there are limits to how many members you can directly add to a group per day.
Additionally, per day does not mean calendar day; there will usually be a 24-28 hour lag before more users can be added once you have exceeded the limit.  The limits are noted on the Add Members page in your group.

Important Notes regarding use of this feature:

• It’s against the Yahoo! Groups Terms of Service to add people to your group without their permission. Yahoo! Groups provides the Add Members feature as a convenience to group moderators for those occasions that require directly importing a few email addresses to a group. If you abuse this feature, your group will be deleted and your Yahoo! account will be suspended.
• Yahoo! highly recommends using the Invite Members feature as the preferred method to add members to your group.