You can install the forum Kunena on the template Pulse?
See the information below
>>>> Kunena 1.7 requires MooTools 1.2+ (included in Joomla 1.5.20+). Please check with your Joomla template developer to make sure your current template supports MooTools 1.2+. All Joomla 1.7+ templates will be based on MooTools 1.3 and many Joomla 1.5 templates (created after July 2010) are compatible with these versions of MooTools.