Furless

@Furless No problem :-)

@fauxpunker Many thanks, again, for you diligence in finding a solution to my dilemma. Your explanation is fine, truly. Now, when I get a chance I shall look into it. I very much appreciate your assistance. :-)

OK, so I've been updated. To give it the little "completed check mark", you just have to make a story group and put the desired story in it. Now, creating a group doesn't mean you have to actually have more than one thing it. Once I was given my refresher, I found that the stories I have marked as complete are essentially story groups with only one chapter. Once the group has been created, you get the manage option. 
          
          That was probably a horrible explanation. This may be more helpful. http://support.wattpad.com/entries/21765506-how-do-story-groups-work

@MyztikalTearz No problem - thank you for all your help and for sharing your knowledge! :-)

@MyztikalTearz I forgot to mention, no where could I find an option to rate my work as "G" - only [PG], [PG-13] and [R] were offered. Very curious...

@fauxpunker Many thanks, Fauxpunker! Glad to know I am not the only person experiencing this. That is truly a relief.

@Furless Howdy! MyztikalTears summoned me. So, I checked my short stories and noticed the same thing with the "completed" function. However, all my "chaptered" works still have the option. I'm thinking during an update, WP got rid of the option for works that aren't grouped into a larger body. Some of my (much) older shorts still have the "manage" button, which leads me to believe that it happened in an update along the way. I'll check with some folks and see what I can find out.

@MyztikalTearz Thanks for the instructions - try as I might, I could find no "manage" link or button. There is: "new part" "edit" "delete story" and "new story". When I go to the "edit" link, I still cannot find a manage button. Perhaps the problem lies in the browser I'm using - very frustrating.
          
          Anyway, thanks on the good luck wishes with my 6th novel. And for the other good information you shared! I appreciate that you took the time to offer up some suggestions and express your thoughts.

@MyztikalTearz I'm not familiar with the "complete" tag you are referring to. When I submitted my work to Wattpad, the options for publishing and how you presented your material were very limited. Huge changes have apparently been made since then, so I'm not aware of all that is there for the writer. Don't know if I shall upload anything right away. I'm working on my 6th novel right now, as well as other projects, so my time is limited.

@MyztikalTearz Thank you for taking the time to read my poems and short stories! And for the suggestion about the REPLY link. I am very happy you found my work enjoyable and that you took the time to leave several comments. I appreciate your suggestions and will take them under consideration. My gratitude. Cheers!