How does 4399' s touch dazzle dance accept apprentices?

If your level is below 35, you can click on your social interface, click on the mentoring group, and click "I want a master".

If your level is above 35, you can't learn from the teacher, you can only accept apprentices. Then you open your personal information interface, and there is a "I want to accept an apprentice" above your personal signature. Just click it and it will be OK.