Help!! How to select the part of object in object mode?

I have set up all rigging on my object, but after I switch to object mode, one problem comes out, it only allows me to select the whole object. So as my title, how to select the part of object?

I have set up all rigging on my object, but after I switch to object mode, it doesn’t allow me to select the part of object. If I can’t do that, here will be a problem to put the texture on it.

Object mode deals with objects, Edit mode deals with the vertices/edges/faces of objects
You cannot select just part of an object in object mode, you need to go into edit mode

Hello, if you want to animate your Rig you need to enter “Pose Mode” by pressing CTRL+Tab or clicking on the Button with “Object Mode” and then choose it from there.