IMAGE READY------
you may need to download quicktime player if not already
step1
First off, you'll need to get a .mov quicktime video file. a great place to find one is
GameTrailers.Comright click the button that links to the movie and save target as..
step2
File>Open a ready made sig.
this is mine.

step3
Next, do File>Open
Select the quicktime video you want to use, and open it
this will come up:
sorry for inconvenience click here for examplestep4
pretty sure you're not going to use the whole clip, but if you are skip this part.
click Selected Range Only. You should only use a small clip to begin with, but if you must use a rather large clip, then also select Limit To Every 2nd Frame. (You dont want to choose anything more than 2nd frame because then it will look bad)
-When selecting the clip from only a selected range, pick your starting point and be sure to hold the SHIFT button while dragging the pointer across progress bar to your end point.
Now you have the quicktime video in image ready with all of its frames.
***NOTE*** - It's recommended that your video is less than 150 frames. You shouldnt use a clip that is more than 150 frames because the file size will just be way too big, and you'll need to optimize a lot.
all the frames have a default delay (0.03 sec). it makes the animation look choppy so select all the frames by highlighting the first frame and then highlighting the last frame by starting off with the first frame highlighted, hold down shift, scroll all the way to the last frame, then click the last layer. click the delay, and then click No Delay.
to fit in the sig you have to resize movie.
Image>Image Size and enter in the size to fit the sig.
Jump to Photoshop by hitting this button

sorry for size
PHOTOSHOP------
The gif should also be in photoshop with all of its layers along with your ready made sig
this is the part where people usually mess up
to have a working clip, you can't just drag the layers onto a background. Instead, increase the canvas size of it by going to Image>Canvas size
*NOTE* - when changing the height and width of the canvas, make sure you are changing the size in pixels. Also make sure you set the anchor to the left or right, unless you want the video to be in the middle of your sig.
Now link all of your layers together. this can be done by going to the first layer and click and drag all the way to the last layer.

If you want to move the clip to a slightly different position than it is already in, then select the first frame and by using the move tool, drag the clip to wherever on the sig.
Insert the ready made sig as the very FIRST frame
Put this back into image ready by clicking the jump button (posted above)
To save this as a moving gif, go to File>"Save Optimized As"
Final product (for the sole purpose of showing you how to insert a gif):
*HOSTING* - If you're file is small enough, you can host it at www.photobucket.com (has a 250k limit), but if it is rather large, host it at www.imageshack.us (has no size limit)
You can add other fancy stuff to your sig such as borders and text by adding it on top of all the animation layers. You can do something like this when you add all the bells and whistles:
i tried to blend the sig with the movie. this is my first movie sig, and i think it shows.

thanks for reading
********I DIDN'T MAKE THIS, I JUST PUT WHAT I MADE. CREDIT TO
http://www.visualdesigncore.com/tutorials/photoshop/58/ ********