issues with Jude Community

1. Can't see actor symbol in sequence diagram. Dragging from use case diagram is not working as someone suggested. If I use stereotype then I must have a class for that actor in system, which is not the case for me.

2. How to show conditional flow in sequence diagram - if something is true then execute this method else go back.

One general.

1. How to show group of classes in component diagram. For example, I don't want to show all the entities as they are already present in class diagram. How can I club them and what name I should give?

Thanks.