and very new to this forum ^^ i don't even know where to post or go to ask questions

so forgive me if i'm doing this wrong.
first, i just want to know why my initialize option isn't doing anything to the object? i tried open file, import or simply using the default sphere present

this is what i did (exactly)
run zbrush> chose default project> off edit> ctrl N> import file> click drag> f> turn edit on> initialize> i tried all that's under initialize, nothings happening
(if any got advises or suggestions i would be very happy to know

thank you!
ps:i wanted to use this feature to re-scale or something a 7year old childs features into a baby 1y/o
(is that possible? or you guys have better suggestions? ^^ i just saw it in youtube and thought i could try?)