My pics that I try to post show up sideways on here. What am I doing? Thanks!

Are you turning your camera sideways when you take the picture. You might need to rotate it when you edit.

Could it be that they are too large.
I think there is a size limit. Looking
in the help may be good [you may have already]
In the help section are the list of moderators
who will know more than I do.

Try this go to your picture and while your cursor is on your picture right click your mouse. You’ll see a list, select rotate clockwise. Keep clicking until your picture is facing the right (correct) direction. Hope this makes sense and works for you.

This is a function of how your picture is stored on your computer/device. Whatever way it is stored there is the same as it will appear on the board.