It isn't possible to select fonts from the toolbar in Confluence, although I have created a new feature request for you to ask that this functionality is added to a future version of Confluence. You can watch/vote/comment on the feature request here: https://jira.atlassian.com/browse/CONF-26129
In the meantime it is possible to change the fonts used in Confluence by following the instructions on this page to create a CSS stylesheet for your downloaded Confluence instance, however please be aware that this solution isn't permitted for your OnDemand instance: https://confluence.atlassian.com/display/DOC/Styling+Fonts+in+Confluence
All the best,
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