what photo software do you have on you pc?? what you need to do is resize original then load in to photobucket then make posting
I use photoshop and resize pic to 72dpi about 10cm by 6cm (don't do pixels) but they alway show for me that way
I resize mine in one of two ways. Either I resize them on my PC using PhotoShop OR I upload them to Photobucket and use the resize option on there. If using Photoshop I tend to make the longest dimension 500 pixels.
I found that photo-shop was the easiest. Go to 'Photo' on tool-bar at top of page, click on 're-size' and go from there. It is a good idea to re-name the pic. including the new size in the name, then you won't get them muddled up!!!