How to insert a gallery to a post?

Hi i have media gallery licence but i cant insert a gallery with 20 items into my post.
How can i do that?

And another question is that, when i create an album, how can i put it into a category?
 
There's a button on the editor that will allow you to click which media items you want to show in a post:
xengallery_sprite.png


Albums can't go into categories.
 
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