I kinda feel responsible for telling everyone how to add pictures to threads, and I don't want to get in trouble because pictures are oversized

Would it be possible to resize the pictures to 550 px wide or less? You can do that in photobucket using the edit tool (if you don't have a software on your computer that allows you to do it)

Then save it as a new picture (or over the old one) copy the HTML code for the image : should look like this "img src=" and voila! your image should pop up when you submit your post/comment.

Here are the steps (if it hasn't been working for you)
Using Photobucket
Upload the picture you want
1 - click edit on the picture you want to edit.
2 - Click adjustment > resize
3 - Write the dimension wanted.
4 - CLICK APPLY (this is the part people skip)
5- Then save

Thanks!!!