I cannot save a recipe. I've signed in but it won't let me save it.How does one save a recipe?

Go to the recipe. To the right of your screen there should be an oval "save" button. Click on that, and you get a drop-down menu with headings of your files of saved recipes, and either choose one of the headings (collections) that you already have, or scroll to the bottom to the blank field to create a new heading, type it in and press the "add" button.