Check that Color Feedback is
turned on in the Display section. Color
feedback helps you identify the weights on the surface
by representing them as grayscale values (smaller values are darker,
larger values are lighter).
TipYou can use the default
hotkey +c (Linux
and Windows) or +c (Mac
OS X) to turn Color Feedback on and off outside
the Tools Settings Editor.
Select the joint cluster you want to
paint weights on. In the Paint Attributes section
of the Tool Settings window, click
the jointClustern.weights button and select the appropriate joint
cluster weights name from the pop-up menu.
TipIf you are painting
on a single surface, you can skip step 3 and select the joint cluster
without opening the Tool Settings window by -clicking the
surface and selecting the appropriate joint cluster weights name
from the Paint command submenu.