Before you can sign up for a class, you must  first sign in using the link on the left hand column.  If you have not already created a profile, you will need to do that first.  Then...  

Select a topic from under the top Categories line and find the class you are looking for.  For example:  To find a Ceramics class, under the ARTS category click on Crafts.  If you can't find the class you're looking for, try the search button in the left column.