Discovering your radiance
Basically, radiance is a state of being rather than something you do, but there are some practices that can help to uncover your natural glow.

Being present. The mind is like a butterfly that flits from one flower to the next. Seldom do we find ourselves nestled in the excuisite and eternal ocean of here and now. When you are, you can connect with your true self that is beyond the chattering of your mind. When you take the effort to focus your drifting consciousness to become fully awake to the present moment, you will discover the glorious light that dwells within you.

I am responsible for what I see.
I can elect to change all thoughts that hurt.
I could see peace instead of THIS.
The past is over - it can touch me not.
This instant is the only time there is.
Today I will judge nothing that occurs.
I am not the victim of the world I see.
I can escape from the world I see by giving up attack thoughts.
I am determined to see things differently.
I am never upset for the reason I think.
Forgiveness is the key to happiness.

All that I give I give to myself.