1. Login as the admin and go to Admin > Members > Lookup.
2. Search for the member by name, then click Find Members at the bottom of the page.
3. In the result list, click on the member's name to edit their account.
4. Click on the Security tab in their account.
5. Set their password manually by typing in a password in the password field. Click submit to save.
Now provide this password to the member and they will be able to login with their email and the password you gave them. Once logged in, they can reset their own password.