Hey twan from thumblogger
Your first question:
How do you put images with link in the side boxes, and how do you ad boxes? It doesn't seem to let you do that.
Just use html code.
You can upload "myimg" to ImageTurtle.
You're right, it's limited to 5 boxes exclusive the Categorized, RSS and Shared box. But with a little trick you can get as much boxes as you like:
Note: please use the thumblogger support forum cause i'm not visit netpond every hour.