To add Meta Tags, first go to the All Properties panel for the XPage. The navigate to Resources under Basic.
Then select the plus button and select xp:metaData to add as a resource
Input what you need and you're done.
And this is how it looks in the XPage source...
HEALTH WARNING:
We've currently a bug (PRID7NBUJ3) with using httpEquiv where the wrong attribute gets rendered. A fix for this issue will