Calendar write protected

em-client version 9.2.1735 (3d90379)

When I try to add something to the calendar i get the following error: Failed to save item because account is read-only
How do I correct that?

Some calendars are read-only, like holiday calendars for example. Some shared calendars may be like that as well, and Internet calendars are always read-only.

Before you save the event, choose the correct folder from the drop-down selector next to the Save & Close button.

Thank you - this solved the problem:-)