If you take pics with a phone, email them to yourself. If it's with a camera, transfer to your computer.

Then when you post a reply, there is paperclip symbol just right of the fonts, size and color tabs. Almost top dead center of the box you write in. Click that paperclip, then pic one of the five slots in the pop up. Click browse and find the pic in your computer folders. Once the pic chosen click upload.

Personally I'm not sure what temp is optimum. However I've seen many people say 68-72 ish. I could be wrong though. I just know 90 is way to high.