By default for new users Jiglu uses a simple plain text input method for users to enter discussion messages and blog comments. If you prefer that users be able to enter richer formatting - like with discussion messages and blog posts - then you can change the default.
Go to System settings and choose the User defaults option. For the Default input method for messages and Default input method for comments settings change the default to HTML editor and then select Save.
If you want all users to always use the HTML editor for all contributions then uncheck the Plain text option on the form.