Hello. Bumblebee Ball she's 4 months old housed in a 55 gallon aquarium. First random question is how do I post pic?

Next question is where is a good place to put my digital thermometer hydrometer sensor. The sensor itself is on the end of a white cable. I have it under the repti bark very close to the heater (reading high temps right now) and thought to move it to the top of the substrate then thought about contacting this forum to see what you all think. Thanks!