Information boxes are created with the Infobox template. To use the template, just enter this:
Here title is the bolded headline and content is the actual content of the box. The content can include multiple paragraphs and any Wiki markup, just be sure to mark where it ends with }}.
Note that the template should be placed at the front of the article section, so the actual article content can flow around the box.
How not to use infoboxes
Try not to go overboard with infoboxes: we are not trying to replace Wikipedia here. As always, the infobox should aim to educate the traveller with what he needs to know, which probably does not include the primary school grades of Person X or the name of the associate vice president of marketing for Festival Y.