But where on the front is the panel for charging. I don't see it.
The light-receiving solar cell is under the dial, and cannot be seen. The dials are engineered to let through a portion of the light that falls on them, but this is not apparent visually; they look like normal dials.
On changing watch batteries yourself (for ordinary battery-powered watches, not solar powered):
If you watch does not have a high water resistance (50m or better, also known as 5 bar or better), the case back is likely a "press on" type. Look around the edge of the case back (where it touches with the main watch case) for a small slot; if you find such a slot, the case back can be popped off with a small screwdriver (insert into the slot & twist). Once the case back is off, replacing the battery is easy. The battery is held in with a little spring level that can be pushed out of the way; then pressing on the battery usually will pop it out. Note the number on the battery, buy a replacement, pop it in, replace the spring lever, press the case back on until it clicks into place. Done!
If the watch does have a high water resistance, the case back is likely a screw-on type. Look for notches around the edges of the case back (usually 6). These are much harder to get off, and these cheapy tool kits will likely not be sufficient to do it, or at least not easily. The easiest method for this type of watch is to wad up a ball of duct tape, and use that to unscrew the case back. The hardest part is gripping the watch firmly enough to resist the twisting motion.
