You always want to make sure you save your avs as a .gif first of all, and please do save it in case your prp file decides to die on you.

Also be sure you have applied the palace palette to your doll/avatar. If you don't you'll have to do some editing as the colors will turn out slightly warped once put into palace.

To put your doll/av into Palace, simply drag a selection around it, also making sure its no larger than 132 by 132 pixels. Then hit the ctrl + c keys to copy your av, or go to Edit Copy.

Once that is done, go into Palace, and go to Edit in the menu bar and click on Paste Multple Props. Your doll should now appear in your prop bag.

And, thats all there is too it. You can now go into the Palace edit for each of the peices of your doll and delete the background.