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Once you're done click Save at the bottom of the page and you should have a button!
Additional Information
Where can buttons be used?
Buttons can be used anywhere that links can. This includes other content types outside basic pages like Events, Articles, Research Areas, etc. They can also be used inside of blocks or in sidebars.
What sort of links can buttons be used for?
It can be used for internal links (links that lead to other pages of your website), external links (links that lead to a different website), PDFs, and emails.