How do you insert new tiles.

What version are you using? I'm asking because the menu options change slightly in some. Anyway:

1) If you know how to get into the tile pages, find an empty page.

2) You should see a little box that says "Grab" in it.

3) Click it, and there should be another box that says "file."

4) Click it to browse for the file you want (A bitmap[.bmp], a GIF, or PNG, JPEGS are not recommended as they usually come out distorted)

4a) To grab tiles, you need a picture in one of the formats mentioned above.

5) when you find the file, click OK and press the (+) or (-) buttons on the number pad until the Image looks "right"

6) Thats how to get new tiles, whether they can go in that palette is another story.

Misc:
Later betas have the option of pressing "R" to recolor images (press "R" between steps 4a and 5, but DO NOT press the (+) or (-) while the thing is in "recolor" mode.)

I'll edit this post if you need more info.

EDIT:

To replace Link sprites:

1) go to Quest -> Graphics -> sprites -> link
2) click on Link
3) The rest is self explanitory.

O.K. Thanks, but now I need to figure out how to get the palette right. My new character keeps coming out a neon bright color.

Well, you usually have to recolor them, it's pretty much work but use the wand.

Link always uses Cset 6, so you have to colour him into Cset 6