On your pictures, go to your photo image program. Select the picture, select resize. Crop unwanted sections. decrease resolution. and decrease the over all size. You have to play with the size, because the finish product may not reflect what you want.
When you are ready to insert picture, hit browse from the post page. When I put the mouse pointer over the picture, it will tell me what the Kilobytes are for the picture. If it is less than 100kbyts. it will go through . I use HP Photo Image Editor.