Wren Wiki help
There are a couple of ways to add modules to a patch. The regular way would be to drag them out of the module selector and drop them into the patch window.
The patch window also has a right click context menu which will allow you to select a module to insert.
From the file menu it is possible to export sets of modules (with their wires) for a later import.
There is a standard import to be used when a new patch is being created, the idea is to create a basic setup and save that as 'template new'. Then when a new patch is being created that template will be loaded into the empty patch.