Lyx - Add appendix after bibliography

Lyx - Add appendix after bibliography

How can I insert Appendix after Bibliography ? If I put the cursor after
the last character of the bibliography, the the last line of the
bibliography is inside the appendix. If I click return after the last
character of the bibliography, then insert the appendix, a new key appears
in the appendix, and if I remove it, the appendix disappears.
Thanks,