How to upload Holga pictures onto your computer?

You have to change the settings on your scanner so it scans at a higher resolution.
You scanner and your monitor are probably not calibrated so that's one of the reasons why it looks different from your monitor. You're taking a printed picture printed with ink and transferring it to the computer where your monitor is RGB (red, green, blue which is light)
You can just fix the colors a bit in photoshop or any editing program to fix it to look similar to your picture.
EDIT:
You can buy a film scanner which could be pretty pricey but a scanner will work just as well. Or when you develop your film you can ask them to put it on a CD for you which is a little cheaper than buying a film scanner depending on how often you develop film.

Most people either have their own film scanner, or they have sent the film to be scanned at a pro lab. Because the cost to buy your own scanner is so high (and it's time consuming!) most people will have their film processed and scanned at a pro lab. If you don't have a pro lab near you, you can send your film to a some place like the Icon that handles mail order.

Good, quality scanning directly from the film will be much higher quality than scanning from prints.

Get a film scanner. It costs a fortune, but you will get better scan than doing on from a print.

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