Regular members can't make guides anymore. That functionality was removed. Only the Instructables staff can make them. If you have an idea for a guide, pitch it to one of the PTB's, and if they like the idea, they'll make one.
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How do I do that?
At the bottom of the page is a link that says "About". Clicking that link will bring up a listing of all the Instructables admins, along with a description of what they do. Click on an admin and send them a PM describing what you want to make a guide about, and why you think it would be a good thing to have a guide on. If they agree, they will arrange for a guide to happen, or possibly give you the access to make it yourself. I don't know which admin would be the best to contact, but I've heard that noahw and scoochmaroo are both good choices.