There exist several options for support. At first the documentation on this site should solve most of the common questions. Follow the tutorial for first steps.
We have a FAQ that answers some common questions.
There also exists a mailing list that is activly monitored. This is probably the best place for your advanced questions. To subscribe send a mail to users-cedarsoft-serialization+subscribe@googlegroups.com.
For very urgent cases you may contact support@cedarsoft.com. But of course free support is limited. Nonetheless just ask...
Commercial support is available. Just ask info@cedarsoft.com for details.