This assumes that you have previously created your steps and are now coming back to add the content.
Click on Classrooms in the top left of the window
Click on the Classroom Entries tab
And scroll down to the listing of your Steps. Click on "Edit" on the far right next to the step that you want to update.
You can now enter or modify your content in the step in the Body section.
Enter the text that you want here. You can copy and paste text into the Body section. If you’re pasting from a Microsoft Word document, you may need to use the Paste from Word button. If you’re pasting from a web page, you may need to use the Paste as Plain Text button.
At the top of the body section are icons for formatting and other features that you can use on your text. Hover over the different features to identify what they do.
Once you have added and edited your text, scroll down to SAVE and PREVIEW your work