1. Sent a subcribe email to `ifem-users+subconfirm@googlegroups.com`.
2. Reply  the confirm email from `ifem-users+subconfirm@googlegroups.com`
3. You will get a welcome email after the group owner approves your join.
4. Now you can email your questions about ifem to `ifem-users@googlegroups.com`, and the ifem developers will answer your question as soon as possible.

Instruction written by Huayi Wei.