To change an individual product title, go to ‘Products’ then in the table click on the product title shown in the screenshot below and enter the title you want.

To add a blanket rule to all product titles, go to ‘Settings’ – ‘Feeds’ and scroll down to ‘Product name template’. Here you can optimise the title by adding data from your product information e.g brand or colour. For further help on how to do this see the FAQ:  How can I tailor the ‘Title’ on eBay for my products?