How to add or change your product colour in osCommerce template?

 1.  First go to yourdomain.com/admin/login.php. 
 2.  Username and password is required to login. 
 3.  Click Catalog in left navigation once you've logged in. Then click Products Attributes. 
 4.  Click Add New Colour. 
 5.  Enter your colour name in your languages. 
 6.  After your work is done click Insert. 
 7.  When you've added colour you can use it to add to your product. 
 8.  Enter your product. 
 9.  Choose the option you want to be added. (Colour is in our case) 
10. Choose the option value. You newly added colour should be there.
11. Click Insert to add product's colour.  
 
You can see video tutorial below.