Started First Website

I am now experiencing a little more confidence in moving things around and posting information on an actual website I know I need to move some Widgets around because of the size.  Entering information into a post for the HTML only shows the code, I have to upload the actual picture and insert a link.  On the side bars I can enter the HTML code on the TEXT widget and the picture, Animation, and link shows up.  Now I need to change to different theme to side bars on both sides.