pipe a tip 5 mound of icing in center of wax-covered flower nail. then using tip 81, make little petals all aroung mound starting with tip in the mound and pull out.then, do it again with a second row around and start tip between two petals. keep going untill you have done about 4 rows. oh, and pull up slightly at the end of each petal. I hope you can understand this. maybe someone else could explain better. I haven't done very many of them.
You start at the bottom. Let me see if I can fiond you a how to link.
Deborah
Not sure if anyone else does this - but for bigger mums I like to use half of a large marshmallow and pipe on that instead of the mound!
Here is the link to Wilton's "How to". I tried googleling "Mums" but practically all the results were from posts made by crazy australians talking about their moms (no offense to all you aussies, but it was kind of frusterating 
).
http://www.wilton.com/decorating/basic/mums.cfm
HTH!
Deborah 
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