On energypedia, you can link words from your current article to any other existing article, other external links, or categories. To link to a category:
1. Highlight the word(s) that will build the link later.
2. Click on the "Insert Link" symbol in the toolbar.
3. A dialog window appears.For the option, "Define the wiki page for the link", type ":Category:XXX(desired category name)".Confirm with "OK".