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Smashing picture Bratti, but don't worry too much about the size as I will expand it for the poll. However, you can post bigger photos by using a photo hosting site, I use www.imgbb.com who offer a half decent free service. Alternatively there is plenty of information here in the Announcements section..
There are probably other ways to do it, but I upload the image to a free web hosting site. I favour postimages and use it for my photo' cloud storage, but there are lots of other hosting sites as well such as dropbox or tinypic.
Copy the URL of the image you have uploaded then click on the "insert image" icon that looks like a yellowish coloured envelope (it's actually a mountain and the sun) above the comments box where the Bold and Underline buttons etcetera can be found. Clear the typing area that appears then paste your image URL, then click OK, then click Submit Reply in the normal way.
You could start a test thread and have a play with it to see how you get on.