As Deb says you can only add an individual recipe to your Bookshelf if it has an online link. However, if you own the magazine, why not add the complete magazine to your Bookshelf - if you have a subscription, you can tick the EYB 'subscribe' and new issues will automatically be added to your Bookshelf each month. I realise you have previously clipped recipes from magazines that you like the look off - probably because it's an easier way to file and be able to find recipes in the future. But perhaps now that you're an EYB member it might be worth considering leaving the magazines intact. You now have a searchable index of the entire magazine, and you may find that in future a recipe that didn't initially appeal may later on, as tastes change. When you receive a new issue - instead of clipping - use Bookmarks and personal notes to mark recipes you want to try.
There is, of course, a question of space!
Also, if you come across a recipe from an indexed magazine that is available on the magazine website - let us know and we'll add it. Our indexers periodically go back and check, but some do get missed.