You will find here a new tutorial for paint.net. I will teach you how to add a nice frame to a picture. In order to achieve this, you need a frame and a picture to frame :
It is better to have a frame a bit larger than the picture to frame. If you don’t know where to find frames, check out there.
Then, here are the steps :
1/ Open the picture to frame;
2/ Paste in a new layer the frame (open the frame, select it with CTRL + A, then copy it with CTRL + C and finally paste it in the newly created layer with CTRL + SHIFT + V);
3/ Adjust the frame to the picture to surround it tightly;
4/ Merge the layers (CTRL + M).
Here is the final result :