How Do I Make My Posted Pictures Have The "To Make The Image Bigger, Click Here" Message At The Bottom Of The Picture?

Since most web surfers are doing so in 20 inches monitors (or more), I tend to post pictures at 1200 pixels so they can be better appreciated.

1,100 pixels wide:

The pictures need to be over 500 pixels wide to give you that message. I have seen post of yours and the reason why you don't get the message is because your pictures are 500 pixels wide or less. Once the picture is over the 500 pixels, the forum's software will make the adjustments and you'll see that message automatically. Hope this helps.