If you want to edit an existing page on your website, here are the steps:
STEP 1: Log in to your website (if you don't know how to do this, click here). Once in the dashboard, click Edit Site at the top left. This will bring you to your actual website, but it will look a little different because you are logged in for editing.
STEP 2: Navigate to the page you'd like to edit and click the Edit current tab at the top of the content. Alternatively, if you've never edited the page before, you'll see a Customize tab. Click on that one.
STEP 3: Modify whichever content you'd like to the text editor and hit Publish (at the top right) when you're done. You may wish to click Preview or Save Draft instead of Publish if you'd like to review the content before publishing.
If you're wondering how to create a brand new page, click here.