How do I configure meta tags for a panel page? How do I configure meta tags for a panel page? I want to change title, keywords and description.

Ideally I want to use Yoast.
I have the same requirement and one of the patches attached in the issue titled "Panels / Page Manager integration" worked for me. This patch basically adds a module of panel pages which when enabled, provides interface to configure meta tags for each panel pages under /admin/config/search/metatag.