Right Click & Save Image or Save Image As to your Desktop

Rename your standing animation "vgstand.xaf"
(without quotes and case-sensitive)
Rename your sitting animation "vgsit.xaf"
(without quotes and case-sensitive)
Rename your facial expression "vg.xpf"
(without quotes and case-sensitive)
and
place it into product folder(IMVU Classic)
or
File-> Import Assets(IMVU Studio).