To insert a snippet, you can do any of the following:
From the Snippet panel, double-click on a snippet or type the name of snippet and press Enter. You can activate the Snippet panel first so you can type into it by using the Activate Snippet Window command (Ctrl+Alt+S).
From the Edit menu, select Insert Snippet > "snippet name".
Use the Complete Snippet command (Ctrl+E) to pop up a list of snippets.
Start typing a snippet name and the auto-completion list will show the snippet. Note that having snippet names in the auto-completion list is optional.