Hi Dave, welcome to the forum.
This is a terrific community and a wonderful resource, use the rolling menu bottom right and you will find forums for just about every art and craft medium here, it's worth exploring the full list of the forums. Read the posting rules at the top of the forums there may be restricted posting.
The links in the top line of my signature will help with the forum and how to resize and post your pictures. You can start uploading pictures on your third post.
When you get the uploader box and browse for your photos, make sure you select "All files" or you will not see your jpg files.
If you have a particular site problem, click on my name and send me a private message (pm).
If you are working in watercolors I suggest you check out the Watercolor Forum
The links in my signature will take you to lots of watercolour demos, workshops, articles, videos and free online tutorials.
There are many talented and generous artists in the forum who will love to share your art.
Introduce yourself in the "Daily Wash" in the Palette Talk forum - they are a great bunch of folks.
I look forward to seeing some of your work in the Watercolor Gallery, or in the Watercolor Studio if you need advice. Technical questions are asked in the Learning Zone.