If the admin menu is closed, click on the title to expand it.

If the "create content" submenu is closed, click the plus sign to expand it.

Click the "Antyre glossary entry" link.

On the page to which you are taken, fill out the fields, "Term," and, "Explanation."

Since you will probably be entering more than one term at a time, hit the button that says, "Save and create another." This will save your entry and take you back to the creation form to create another one. Terms on glossary pages will sort themselves into alphabetical order regardless of the order in which they are entered.

Lather, rinse, and repeat as necessary.
To edit existing entries
Go to Content management >> content >> list

Click the "type" radio button. In the drop-down menu beside "type," make sure that "Antyre glossary entry" is selected, and click "filter."

Now only the Antyre glossary listings will show. Locate the item you want to edit and click, well, "edit." After that, you go through basically the same procedure as when you create a new entry.

When you are ready, you can edit or delete the "under construction" entry by clicking the edit for it. To delete it, simply scroll down the page to which you are taken after you click edit, and at the bottom you will find a delete button.
*Special notes: In order to make things easier on you, I have broken certain "best practices" rules. Let me know how this process works for you.
;-)