how to programmatically set 'Meta Tags' content

I tried Planetarium demo, and want to change top_right tag content binded with planets in runtime.
What API should I use to achieve this?
and is this a right way to set name and other info above character model's head?

Hi,

I tried Planetarium demo, and want to change top_right tag content binded with planets in runtime.
What API should I use to achieve this?

This can be done using custom anchors. See this code snippet.

and is this a right way to set name and other info above character model's head?

Yes, you're on the right track.