I took a moment to look at the figure, small. If I were you I wouldn't use that model and rig. The problems are way too much to correct in my opinion.

The mesh is asymmetrical and composed entirely of tris. Not ideal. Fixable, but with difficulty, as far as asymmetry goes, but not worth it in my opinion. There is a host of problems with the geometry... Some still usable in Poser, some that are more troublesome.

The UVs are a stacked, nonsensical, jumbled mess.

There are no typical Poser figure material definitions that you would expect.

The rig it loads with is also asymmetrical along the main center line hierarchy, with the hierarchy from hip to head you want the center and end points 0 on the x axis via each relevant actors joint parameters. You can fix this via Joint editor. Additionally each chain of actors terminates in what I can only assume to be a useless anchor bone (a bone used to keep a drawn out bone from being pulled out of orientation when drawing out a child). I'm just guessing, though by logic they would be useless in that capacity too. These bones should deleted, serving no purpose of any sense. Basically a series of useless ghost bones at the end of a hierarchy chain.

There are no head part bones of any kind.

There is no finger rigging.

Probably the most troublesome is how the figure is grouped. There are many instances of incorrect child/parent/grandparent grouping. Violations of the children affect their parents but cannot effect their grandparents rule... The chest/collar/shoulder relations and hip/thighs/waist relations are particularly bad. Such a set up will not work. You want your groups to be not touching in that there must be a clear, seperate division between parent, child, and grandparent actors. Not doing so will result in all kinds of problems such as mesh tearing and so forth.

Example...

Current state of chest, collar, shoulder relations: Wrong

It should be grouped more in this manner:

My analysis is that this particular model and rig is not worth repairing, this is just my opinion.