I don't see Handy Tip in the list of macros.

Make sure that you're using Server/DC hosting type. Handy Tip is not available in Cloud for now.

I can't see the text from Handy Tip when I export my page to PDF.

Unfortunately, Handy Tip is not visible in PDF.

I can't insert Handy Tip in the page view mode.

This macro can't be added in the page view mode. You need to go to the page edit mode, highlight any text or emoticon, insert Handy Tip. More information is available here.

I can't insert Handy Tip in the page edit mode.

Make sure that you've highlighted the content to add Handy Tip to. More information is available here.