If you want to upload your image here as an attachment you will need to reduce it in file size. Allowed sizes are shown in the "Manage Attachments" window when uploading.
To resize an image, use any of the available image processing applications available. Several are free; I have used
Irfanview with very good success over the years.
You can also upload your images to any one of the image hosting sites and link to them here.
[Added]
Evan and I were posting at the same time. See post #5 in the thread he linked to for a list of image hosting sites.