Vallejo Thinner medium how do I use this? - + GENERAL PCA QUESTIONS + - The Bolter and Chainsword

I've never used a thinner before. Last night I picked up Vallejo medium thinner. I've known for a while my results would look better if I thinned my GW paints a little . So how do I use this? Thanks.

Vallejo/GW Death Guard Color Conversion (Your Help Needed!) - +

Initial Contrast Experiments (from us all) - + GENERAL PCA

Leadbelcher Spray Acting Oddly with Shades? - + GENERAL PCA

Using a wet palette, please help - + GENERAL PCA QUESTIONS + - The

Streaky Nuln oil on vehicle surfaces - + GENERAL PCA QUESTIONS +

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Issues with Glossy Lahmian Medium - + GENERAL PCA QUESTIONS +

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How do you add texture to your bases? - + GENERAL PCA QUESTIONS +

Initial Contrast Experiments (from us all) - + GENERAL PCA

New painter having trouble shading/washing brightly-colored Space

Initial Contrast Experiments (from us all) - Page 3 - + GENERAL

Glaze or Inks Over Metallic Zenithal Primed Models - + GENERAL PCA