Rebecca,
It is difficult to explain, not knowing your level of skill or knowledge. Login with the admin account for your site, and after login, at the top of each page you should have a button for mode at the top left (view or edit). On the top right, there will be a control to expand or collapse the control panel for the page.
When in edit mode, the control for any modules on a page are visible (small triangle). Mouse over the triangle to see the menu on a module. On a Text/HTML module for example, you will see an option for Edit Text.
With the control panel open, you have options for adding pages, change page settings, add modules to pages and more.
I am sorry if this is too basic.