Check out the video tutorial below on how to edit a page or a post on your website: How to Edit a Page or a Post on Your Website | Website Help
Additionally, see below the video for summary text instructions. 

Edit a Page

1. Click "Website" from Main Menu.
2. Click "Pages" from Top Menu.
3. To edit a page, click "Edit" directly across from the page you would like to edit.
4. Always click the green “Update” button to save your changes prior to leaving page.

Edit a Post

1. Click "Website" from Main Menu.
2. Click "Posts" from Top Menu.
3. To edit a post, click "Edit" directly across from the post you would like to edit.
4. Always click the green “Update” button to save your changes prior to leaving page.