This template uses your wiki's
SITENAME and strips off the word "wiki" leaving what is in most cases the text describing the topic of your wiki. To use this template in its basic form, simply add the Template:T template wherever you want your topic to appear in a sentence or section.
If your wiki's
SITENAME minus the word "wiki" is not a good descriptor for your wiki's topic, you may also simply edit the template and replace it with just the text you want displayed.