Admin edit a product

Today I created a form which would allow the user to edit the information about a selected product. The user would log into the website using their username and password and then click on the 'edit product' button. This would take them to a page which displayed all the products on the site (below):
















They would then click on a product they wanted to edit and then it would take them to the edit form (below):















The fields they can edit are product name, description, colour, category, price, shop name, address line 1, town or city, county and postcode. I also need to figure out how they would be able to edit an image.