Click on the "Create Sample" link located under the "plus" icon in the header menu.
Give the sample a name that is unique within the project. Remember all samples are uniquely identified by their ids. The name is just to have a second hopefully better memorizable identifier.
Select the type of the sample and specifiy its type-specific attributes.
By pressing on save, you are reditected to the show-sample screen, where may later edit, clone, move, or delete the sample.