I have completed the entry form; embedded the YouTube code in proper place. After logging into Instructables, clicking on You Page, the drop-down menu displays Drafts (1) ..., clicking on Drafts (1) a window displays my entry with a checkbox preceding the entry, I click checkbox then click on the (publish) link and a new window appears that has three tabs. Current tab is Edit. Clicking on Publish fogs the page and the window returns to Edit. I have a Title and have placed a description as well. There is no alteration tried that ends with publication. If I click on preview - the proper video appears along with a Comment. I have been attempting various methods to publish since Friday, March 29th, including changes in browsers, and computers. I am stumped.
I have finally answered my own question: One needs to place something in every box, i.e., Description, embed, and a graphic image. And place Tags. Then depress Upload Files. At that point it was self explanatory. Sometimes I am unable to see the tree in the forest. Maybe this may help another.