Steps:

Post "claim"
Draw the main lion of the person who posted "claim" before you
Edit your original "claim" message to add the drawing

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If you don't want your main lion drawn add a link to your "claim" message of the lion you want drawn
Finish your first drawing before claiming a second
Only post a message if you want to claim- to thank people for their drawings edit your original message
Be patient for the person below you

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If you don't know how to post the drawing:

Upload the drawing to an image-hosting site eg imgur and copy the image address
Edit your message to include <*img src="image address here"*> (without the *)
If the image is big you can add a spoiler [*spoiler]previous line of code goes here[*/spoiler] (without the *)

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(the first person who claims doesn't need to draw anyone)