I have a couple of strips that are adult in nature and a few that are for general audiences , but how do I go about submitting my work to the duck.

You mean post comics on the site?

It's relatively easy. Here's a step by step. I'm sorry if I'm making this very idiot proof since I don't know how tech savvy you are.

While logged in you should see your profile picture with the words "Hi, gecko200". Under that you should see a button called "My Account".

Click on "My Account" to get up your account information.

At the bottom of that page you should see a blue button marked "Create a new comic!".

There you get to put up all kinds of information for the comic like; Name of the comic, a short description of it, the type, rating, style, etc. Filling this out accurately helps people who are looking for a comic like yours to find it.

When you're done putting up the description you like, you finish by pressing the button "Create this comic!"

Now you can access your new comic and start posting pages where you decide the page description and release date.

Finally. There's a forum category that helps people new on the site over here where you should address technical questions like that. Help! How Do I...?

Be advised that when you upload your icon for your comic, the default settings are "everyone" and "adventure"; usually you have to upload it a second time to get it to show up right. Also, I don't know what your strip entails, but check the rating descriptions to see if your comic should be categorized as "adult" or "mature". Most "adult" rated comics are pornish in nature, so your strip might not be as "bad" as you think it is. :)