Thread:Project:Support desk/Interwiki (2)

Okay, so you know how Wiktionary has a sidebar on articles where it says other languages in that article, like "Dansk, Espanol, Francais, Italiano, Malagasy, Polski, etc.", and how those links on the sidebar are made by saying fr:Article and da:Article, etc.? Also, they are da.wiktionary.org, fr.wiktionary.org, mg.wiktionary.org, etc.! How do I make it so that my wiki's software can do this, and have fr.monathevampirewiki.org, da.monathevampirewiki.org, and es.monathevampirewiki.org? I need all three of these for the wiki. Instructions on how to get THIS SPECIFIC FEATURE on my software?