CODE LIBRARIAN
When you choose 'Code Librarian', a dialog box appears with two text boxes. The one on the left is the name of your script, for identification purposes. When you click on one of the items in the left text box, it's corresponding code will appear on the right side. To insert it into your document, at the place where you left your cursor, you can either click on the 'Apply' button, or double click on the item name in the left text box.

Naturally, you can add snippets of code to your Library also. To do this, just click on the 'Add New' button. You will notice that the right text box clears itself of all text and a new text box appears just above the lower buttons, labeled 'New Item'. Also, the 'Update' button turns magenta (that's as close as I can come to exact) in color.

In the 'New Item' text box, you will type in a short name for your script. Make sure it's something you will find it easy to identify with the script you will be entering. Next, either type, copy or drop (drag & drop) the new code snippet in the right side text box. The only thing left is to click the 'Update' button. There, you have it. Your new code is now part of your library to use at any later date.

Also, if you want to change the name of your snippet, or the code within the snippet, press the 'Edit' button. As with the 'AddNew' process, the 'Update' button will turn Magenta in color and in order to update the changes, the 'Update' button must be pressed. If you change your mind, once the 'AddNew' or 'Edit' process is started....make sure to press the 'Cancel' button to cancel the transaction. Otherwise, results are questionable, at least.

Last, but not least is one other option - Insert Code Into Library
To use this, just highlight any piece of existing code you want to insert into the library. Choose the Insert Code Into Library function. In the New Item box - name the code something you can remember it by and click the UPDATE button. IF you do want to change your mind, before you click the UPDATE button, if you click the CANCEL button, it will cancel the whole transaction. It couldn't get any easier than this.